https://pages.htgaa.org/2026b/lina-maria-bello-rojas/week-02-hw-dna-design/index.html🧬 BioColdTrace — Homework #2 Part 1: Define your expression target What exactly should the cells make? In Homework #1, I proposed BioColdTrace, a biological Time–Temperature Indicator designed to transform cumulative thermal exposure into a persistent visible signal. My original prototype was intentionally simple:Hugoen