A protein complex involved in regulation of mRNA processing and apoptosis. It binds to RNA in a sequence-independent manner and is recruited to the EJC prior to or during the splicing process. In humans the core proteins are RNPS1, SAP18 and ACIN1. [GOC:dph, PMID:12665594, PMID:16314458, PMID:22388736]
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M5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component