- The gene encoding LERK-7 (EPLG7, Epl7), a ligand for the Eph-related receptor tyrosine kinases, maps to human chromosome 5 at band q21 and to mouse chromosome 17. Cerretti, D.P., Copeland, N.G., Gilbert, D.J., Jenkins, N.A., Kuefer, M.U., Valentine, V., Shapiro, D.N., Cui, X., Morris, S.W. Genomics (1996)