PubMed=
1731342; DOI=
10.1073/pnas.89.2.693
Fields-Berry S.C., Halliday A.L., Cepko C.L.
A recombinant retrovirus encoding alkaline phosphatase confirms clonal boundary assignment in lineage analysis of murine retina.
Proc. Natl. Acad. Sci. U.S.A. 89:693-697(1992)