Table 1.

Number of onco-homologs of the 9 TK oncogenes across taxonomic groups.

Gene	Protist	Flatworm	Roundworm	Insect	Fish	Reptile	Mammal	Class
ERBB2	5	0	5	0	0	0	0	I
MAP2K1	8	1	0	1	0	0	0	I
BRAF	7	0	9	1	1	0	1	I
FLT3	10	7	5	35	0	0	1	I
EGFR	3	0	4	0	2	0	2	I
ABL1	27	1	4	2	0	0	21	II
KIT	93	5	30	67	0	0	149	II
PDGFRA	89	4	28	67	0	0	149	II
RET	4	0	0	38	0	0	152	II