GRB2 and endometriosis: Grb2-Sos provides linkage to MAPK signaling for integrins (all endometriosis, enrichment P = 2.8 × 10−5, FDR-P = 3.0 × 10−3) is a pathway that includes 15 genes, involving integrin clustering by fibronectin stimulation, linked to extracellular signal-regulated kinase (ERK)2 MAPK signaling.