BAM-12P is a proenkephalin A processing product from bovine adrenal medulla. The supplied sequence opens with Tyr-Gly-Gly-Phe-Met, the Met-enkephalin motif, followed by a short C-terminal extension. That opening tetrapeptide-plus-one is the recognition element for opioid receptors, so this peptide retains opioid activity that the enkephalin core provides. What the C-terminal extension adds is the interesting part. Within the BAM series, extending beyond the enkephalin core changes both stability and receptor preference relative to free Met-enkephalin, and the longer members acquire activity at receptors outside the opioid family entirely. BAM-12P sits at the short end of that continuum: long enough to differ from Met-enkephalin, but considerably shorter than BAM-22P, where the non-opioid pharmacology is best documented. Comparing it against the 18-residue and 22-residue members is the usual way to establish how much of an observed effect depends on extension length. For experimental design, note that this product is offered alongside its own C-terminal fragment (LT1040), which carries the extension without the enkephalin N-terminus. Running the two together separates opioid-receptor-mediated effects from anything attributable to the C-terminal segment, and that pairing is more informative than an antagonist control alone. | 