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An efficient differential subtractive hybridization cloning strategy has been developed to systematically isolate mouse genes whose expression is induced in P19 cells at different times following exposure to retinoic acid (RA). Fifty different cDNA fragments corresponding to RA-induced genes were isolated, of which 40 represent novel genes. Ten of the isolated cDNAs correspond to known genes, of which four have previously been identified as RA-inducible. One of the novel RA-inducible genes (Stra1) has been studied further, and it appears to correspond to a ligand for Cek5, a receptor protein-tyrosine kinase.