Immunogen: Fusion protein amino acids 1-555 (N-terminus) of human Stonin-2 (also known as Stoned B, STON2, STN2 and STNB, accession number Q8WXE9) Mouse: 86% identity (480/556 amino acids identical) Rat: 85% identity (474/555 amino acids identical) >50% identity with Stonin-1 (73/135 amino acids) near Cterminus