Joe Christensen

Joe Christensen

Science films, research software and reports in molecular biology and neuroscience, made by leading fleets of AI coding agents. Each piece comes with its proof.

Films & teaching

Start with these four

Each one comes with a way to check it: its sources, a structure or a dataset.

Film · 8 minutes · narrated

The Ketamine Case

How can one forty-minute infusion lift a depression within a day? An investigation from a person down to one trapped molecule, and back.

Check it
Anatomy and cells come from real data, and the receptor is the cryo-EM structure PDB 7EU7. Sources are listed on the film's page: ketamine.landaulab.net

Short films · a minute or less

One gap, many medicines

One synapse built from real protein structures, showing where an antipsychotic, a benzodiazepine, an SSRI and a psychedelic dock. It opened a series of films that each answer one question in under a minute.

Check it
Structures PDB 6LUQ, 6HUP, 5I71, 6WGT and 3BIW. Each film names its sources, and five are public: YouTube @JoeBChristensen

Film · 2 minutes · narrated

SSRIs: The Replay

How an antidepressant works at the synapse: one serotonin release, run twice, the second time with escitalopram in the transporter.

Check it
Every transporter shape is a deposited structure (PDB 5I71, 7LIA); the motion between them is interpolated and labelled as illustrative. ssri.landaulab.net

Scene · 9 seconds · silent

One neuron, everywhere it reaches

One real nerve cell fires inside a glass mouse brain, and each region it wires into lights up as the signal arrives: 47 centimetres of wiring from a single cell.

Check it
The cell is MouseLight neuron AA0100, from NeuroMorpho.Org, placed in the Allen mouse brain atlas. The glow marks the regions its axon reaches.

Lessons that stop and ask, and things to operate

Lesson · 17 min · 5 questions

Seeing Chemistry: PET in psychiatry

How PET works, and what it has shown in psychiatric disorders.

Lesson · 14 min · 5 decisions

What makes a good PET tracer?

One tracer, followed from a biological question to studies in people.

Lesson · 19 min · 5 questions

[11C]yohimbine: watching noradrenaline compete

How one tracer is used to study noradrenaline, from pigs and rats to patients.

Interactive

Tracer studio

What a PET scan can, and cannot, say about synapses.

An interactive, the reports, and a film for the unit

Interactive · six steps

GPR6 signalling

A receptor in its membrane, rendered from published protein structures (PDB 8TYW, 8T1W).

Trailer · 1 minute · narrated

The Prism

How the research reports are made: agents read the literature and trace every claim to a real source, and it comes back as chapters, figures and short films. The reports themselves are not public yet.

Film for a research unit · 1:38

Underneath the list

Depression is one name for 227 different ways of meeting the same criteria.

Made for the lab

Lab film · 0:46

From signal to evidence

From one detected PET event to the lab's data, methods and themes.

Methods film · 0:48

Counting every particle, as it happens

A brain section builds up, count by count, in real-time autoradiography.

Methods film · 1:00

Same target, two measurements

Why PET in the living brain is paired with autoradiography in tissue.

Website

landaulab.net

The website I built for the lab: its research, methods, films and teaching in one place.

In teachingSSRIs: The Replay is used in an MSc course in translational neuropharmacology, and Seeing Chemistry in a course in biological psychiatry, both at Aarhus University.

CommissionedThe one-minute films were made for an international course in psychopharmacology.

Check itThe lab's Watch page lists the courses and each film's sources.

Algorithms & results

Software and a ranking, with the place to verify each

Open-source software · nine tools · two preprints

SwiftX

Standard bioinformatics tools, rebuilt to run tens to thousands of times faster. Each is a drop-in replacement, tested byte for byte against the original.

ToolReplacesSpeed-upTested by

Result · MICCAI 2026 · ranking released 1 October

First place for reconstruction speed

CMRx4DFlow2026, the 4D flow MRI challenge held with MICCAI 2026: reconstruct each scan as fast as possible on one fixed GPU, with no loss of accuracy. Fourteen teams reached the final round. I entered on my own.

Preprint · 5 November 2026

SwiftLD

The same answers as vcftools, 826 times faster on AVX-512 processors and about 102 times faster on an ordinary laptop. In 167,749 differential tests, no byte of output differed.

Preprint · 29 May 2026

SwiftNJ

Exact neighbour joining, the method behind many family trees of viruses and bacteria. Faster than an already optimised tool on 58 of 59 test sets, 1.77 times overall.

How both are made

A fleet of AI agents, and a check on every step

The films and the software come from one way of working. This is the year it took, drawn from the logs.

Film · 70 seconds · December 2025 to November 2026

The year on one curve

Every light is one AI agent, placed on the day it started, and the higher the curve climbs, the more agents had run by then.

molecular biology neuroscience AI

What I bring isn't expertise in MRI or PET. It's leading a fleet of coding agents.

I design the system around them: the harness they work in and the loops that verify every step. I set up teams of agents that check each other's weaknesses. And when they hit diminishing returns, I get them unstuck.

Storyboard frame: a change from an agent enters a ring, is timed and compared with the reference, and is kept or falls away about 1:10 · silent
Placeholder · in storyboard

From the first prompt to first place

A one-minute explainer of the MRI entry, one real run followed through, goes here.

01

A check comes first

Before any agent starts, the task gets a test it can't argue with. For SwiftX: the output must match the original tool, byte for byte, on every test.

02

Many agents at once

The work is split into pieces, and agents take them in parallel inside that harness. of them so far.

03

Agents check agents

Other agents review each piece and look for the weaknesses its author missed. Nothing is accepted on its author's word.

04

Getting unstuck

When progress flattens, I step in with a new angle, a different check or another team.

The long list

Everything, by date

pieces from May to November 2026, newest first: finished films, single scenes, pages, papers and studies along the way. Point at a tile to play it.

Kind
Field

A piece is dated by its release when it has one, and otherwise by the day its file was made. The agents' work starts in December 2025; the catalogue of finished pieces starts in May.

About

I'm a master's student in molecular biology at Aarhus University, doing my project at the Translational Neuropsychiatry Unit.

I started making these films and tools in my own time. What they share is how they are made: with fleets of AI coding agents, and with a check on every step, so that anyone can see what a piece rests on.

If you'd like to work together, or want to know how something here was made, write to me.

joe@joechristensen.net

Where to follow