Your eye is about to learn how to recognize a bacterial defense system in its neighborhood.

A bacterial DNA sequence scrolls. Several genes glow green — they are already-identified defense systems. Between them, dark zones. One of them is a hidden system. Find it by drawing a rectangle around.

Institut Pasteur published in May 2026 an atlas of 2.39 million candidate bacterial proteins for antiviral defense, spread across 478,206 families, 85% of which were never associated with immunity before this year. No single human can sort that volume alone. Every scenario you solve here calibrates your eye on a REAL system (CBASS, Thoeris, BREX…). Once calibrated, you'll be able to sort candidate families from the GeneCLRDF dataset not yet validated experimentally — and flag those worth lab validation (real contributive mode, milestone J3 of the public roadmap). That is exactly what Pasteur calls « enabling other scientific teams to contribute to the exploration » of their atlas.

This gesture serves NS-1 (organize the exploration of the Pasteur atlas) and the skill-building that makes this exploration possible. See NORTH_STAR.md for the full strategy.