CellType is a Y Combinator W26 company describing itself as an agentic drug company that simulates human biology. It uses foundation models simulating human biology paired with autonomous agents to run complete drug discovery pipelines. Its core technology, Cell2Sentence, converts single-cell biology data into formats that LLMs can learn from, enabling computational drug screening and validation without traditional animal models. The company reports working with top pharmaceutical companies and says it has discovered and validated a novel cancer treatment signal. CellType is based in New York City.