CRYSTAL STRUCTURE OF THE COMPLEX OF PEPTIDOGLYCAN RECOGNITION PROTEIN (PGRP-S) WITH N-ACETYLGALACTOSAMINE AT 3.1 A RESOLUTION IMMUNE SYSTEM, PEPTIDOGLYCAN RECOGNITION PROTEIN, COMPLEX, NGA,IMMUNE RESPONSE, SECRETED, ANTIMICROBIAL, GALNAC, N-ACETYLGALACTOSAMINE, PGRP, ANTIBIOTIC 3COR