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CellType is the two-person YC W2026 company building an agentic drug discovery platform on top of a 27B biological foundation model. Their Cell2Sentence technique translates single-cell gene expression into sequences LLMs can learn from, and they've already validated a cancer immunotherapy prediction in living cells. Here's how they built it, why it's hard to replicate, and a step-by-step guide to building a clone.