PerturbAI announced it has emerged from stealth and publicly released an in vivo CRISPR Perturb‑seq atlas mapping gene function across 8 million mouse brain cells. The San Francisco startup generated the dataset in collaboration with 10x Genomics, NVIDIA and the Allen Institute for Brain Science and said the resource maps effects of thousands of genetic perturbations across brain regions and cell circuits. PerturbAI says the atlas can accelerate target discovery and train foundational AI models for therapeutic simulation; an accompanying manuscript will be posted to bioRxiv and the full dataset is available on the company website. The company also disclosed an oversubscribed pre‑seed round closed in Q3 and positioned the dataset as a public tool for causal genomics in intact organs.