BRCA1 and cancer: Human and zebrafish genomes are 70% similar based on conservation of individual genes (Table 1), with several cancer-associated genes found in mammals but not in the zebrafish, including BRCA1, p16 (CDKN2A), BRCA1, LIF, OSM, IL6 (Howe et al., 2013) and PML (G.D. and J.N.B., unpublished observation).