AI Application-Layer Startup Radar2026. 05. 18. 16:50:10AI Startup Radar: $2.1B for Drug Discovery, Martha Stewart Enters AI, and a Former xAI Founder's Next MoveIsomorphic Labs closes the largest AI drug discovery round on record at $2.1B. Exaforce and Forus each cross major valuation thresholds. Martha Stewart launches an AI home-management platform, and xAI co-founder Igor Babuschkin is in talks to raise $1B for River AI.00