HEADER IMMUNE SYSTEM 31-DEC-69 6RLO TITLE Crystal structure of AT1412dm Fab fragment in complex with CD9 large TITLE 2 extracellular loop COMPND MOL_ID: 1; COMPND 2 MOLECULE: AT1412dm Fab Fragment (Heavy Chain); COMPND 3 CHAIN: A, C, E, G; COMPND 4 ENGINEERED: YES;