INS and pancreatic insulinoma: Other preproinsulin RBPs, at least in insulinoma cells, include hnRNP K [25, 27], hnRNP C, hnRNP E [25], hnRNP L, hnRNP U, HuD [30], and the poly(rC)-binding proteins (PCBP) 1, 2 and 3 [27].