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A. Each of the four vertebrate tetrameric AP complexes consists of two large subunits, one medium subunit and one small subunit. B. Vertebrate AP complexes contain four unique β subunits. D. melanogaster, C. elegans and D. discoideum contain only three with a single β subunit that could contribute to AP1 and AP2. See Supplemental Figure 1 for list of accession numbers for genes/gene products.
