Functional characterization of the protease of human endogenous retrovirus, K10: can it complement HIV-1 protease?
Towler EM, Gulnik SV, Bhat TN, Xie D, Gustschina E, Sumpter TR, Robertson N, Jones C, Sauter M, Mueller-Lantzsch N, et al. Biochemistry. 1998 Dec 8; 37(49):17137-44.