Soodeen C J, Bremner T A
Comp Biochem Physiol B. 1985;80(3):521-4. doi: 10.1016/0305-0491(85)90284-6.
Inbred and wild mice having the same purine nucleoside phosphorylase-1 electromorph exhibit differences in specific activity, Michaelis constants and thermal stability. The Np-1a allele of C57BL/6J represents a high-activity variant. The Np-1 locus appears to be under regulatory control.