An AP-type membrane coat adaptor complex that consists of beta4, epsilon, mu4 and sigma4 subunits and is found associated with membranes in the trans-Golgi network; it is not clear whether AP-4 forms clathrin coats in vivo. [GOC:mah, PMID:10611976]
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M5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component