PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18282596-4 2008 However, accumulating data question this mechanism and suggest that UCP2 and UCP3 may play other roles, including carrying free fatty acids from the matrix towards the intermembrane space, or contributing to the mitochondrial Ca(2+) uniport. Fatty Acids, Nonesterified 123-139 uncoupling protein 2 Homo sapiens 68-72