In addition, the different oncogenic potential of the myc genes was revealed by the average latency period of tumor manifestation; the latency period was 36 days for Eμ-N-myc:Eμ-pim1 mice and 94 days for Eμ-L-myc;Eμ-pim1 mice, but Eμ-c-myc;Eμ-pim1 animals developed pre-B-Cell leukemia prenatally (49). This evidence concerns the gene MYCN and neoplasm.