PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 14989468-8 2003 This difference in the cellular distribution of GM2 in NPC1 and NPC2 null mutants is the first report of a variation in the phenotypic expression of these genotypically distinct lesions. gm2 48-51 NPC intracellular cholesterol transporter 1 Homo sapiens 55-59