Polypeptide reacting: S3-12, apparent Mr 140,000 (after SDS-PAGE) S3-12 pertains to the PLIN/PAT-family proteins, covering the surface of cytoplasmic lipid droplets. Additional PAT proteins include adipophilin (ADRP/PLIN2), perilipin (PLIN1), TIP47 (PLIN3), and MLDP (OXPAT/PAT-1, PLIN5 or LSDP5) which are expressed in differentiation-related stages of lipid metabolism. No cross-reactivity with additional PLIN/PAT proteins (including adipophilin/ADRP/PLIN2, perilipin/PLIN1, and TIP47/PLIN3) which are expressed in differentiation-related stages of lipid metabolism.