Accessibility to Peptidoglycan Is Important for the Recognition of Gram-Positive Bacteria in Drosophila

？ PGRP-SA equally recognizes Lys- and DAP-type peptidoglycans (PGs) ？ PGRP-LC binds to S. aureus and triggers a robust response ？ When WTAs are removed, immunity depends on both PGRP-SA and -LC ？ Accessibility to PG plays a central role in bacterial sensin