Google DeepMind introduces SynthID Bio to watermark AI-generated proteins while preserving biological function

Google DeepMind introduced SynthID Bio on September 30, 2026, a watermarking technology for synthetic biology that embeds an imperceptible signature directly into both the biological code and the synthesized physical protein, without compromising its biological function. This method was verified for protein binders targeting VEGF-A, the SARS-CoV-2 spike protein RBD, and PD-L1, matching the hit rate and binding affinity of unwatermarked versions. Furthermore, SynthID Bio fine-tunes AlphaFold 3’s diffusion network to watermark predicted 3D coordinates directly into the model’s weights, maintaining prediction accuracy while ensuring near-perfect detectability.