| http://www.w3.org/ns/prov#value | - Initially thought to be present exclusively in such specialized cells like muscle cells, ER-PM junctions, also known as PAMs for PM associated ER membranes [6], have later been recognized morphologically in a variety of organisms and cell types from yeast to mammals [1,11,12,13,14], and the quest for the identification of their molecular components began.
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