This A variant of SNP rs245774393, the major variant coding for sserine at codon 6, is found in the following strains: 129P2/OlaHsd, 129P2/OlaHsd, 129S1/SvImJ, 129S5SvEvBrd, A/J, AKR/J, C3H/HeJ, C57BL/6J, C57BL/6NJ, C57BL/10J, C57BR/J, C57L/J, C58/J, CBA/J, CE/J, DBA/1J, DBA/2J, FVB/NJ, I/LnJ, L/J, LP/J, NOD/ShiLtJ, NZB/BiNJ, NZO/HiLtJ, P/J, PL/J, RF/J, SJL/J, SWR/J, and YBR/J. (J:179572)