A-D. Representative electron micrographs of large PARV dendrites (PARV-D) dually labeled with MOR-SIG from a VEH-female (A), THC-female (B), VEH-male (C) and THC-male (D) rat. m, mitochondria; uT, unlabeled terminal; uD, unlabeled dendrite. Triangle, on plasma membrane SIG; Chevron, near plasma membrane SIG; Arrow, cytoplasmic SIG. Scale bar = 500 nm