organelle membrane contact site mitochondria-associated endoplasmic reticulum membrane contact site mitochondria-endoplasmic reticulum (ER) contact ER-mitochondrion membrane contact site mitochondria-associated ER membrane A zone of apposition between endoplasmic-reticulum and mitochondrial membranes, structured by bridging complexes. These contact sites are thought to facilitate inter-organelle calcium and phospholipid exchange. GO:0044233 2010-01-07T04:07:24Z cellular_component mitochondria-associated membrane MAM endoplasmic reticulum-mitochondrion membrane contact site jl