- Isolation and assignment of the UDP-glucose pyrophosphorylase gene (UGP2) to porcine chromosome 3q21-->q22 by FISH and by analysis of somatic cell and radiation hybrid panels. Looft, C., Paul, S., Thomsen, P.D., Yerle, M., Brenig, B., Kalm, E. Cytogenet. Cell Genet. (2000)