Fig. 4. Summary of embryonic gene expression in all studied clones. Cloned embryos are named according to the developmental stage to which they progressed during 4 days of culture following nuclear transfer (pm, pre-morula embryos; m, morula; b, blastocyst). Investigated genes are shown in columns with gray squares indicating expression and white squares lack of expression of a given marker gene. Embryos within each developmental group are arranged such that the most transcriptionally defective are shown above those with fewer defects. Embryos with identical expression profiles are combined in a single row. Some of the primary data are shown in Figs 3 and 5.