Type IV secretion systems (T4SSs) comprise 12 protein components, VirB1–VirB11 and VirD4. VirB2 forms a pilus and is co-purified with VirB5. VirB4, VirB11 and VirD4 are ATPases powering pilus assembly ...
After 10 text and 4 image tests, OpenAI's latest model barely beats GPT-5.1. What are Plus subscribers really getting?