A-D. Representative EMs of DOR-labeled dendrites (DOR-D) from a VEH-female (A), THC-female (B), VEH-male (C) and THC-male (D) rat. m, mitochondria; sp, spine; uT, unlabeled terminal; Triangle, on plasma membrane SIG; Chevron, near plasma membrane SIG; Arrow, cytoplasmic SIG. Scale bar = 500 nm