Table 2. Age at onset, tumor location, and mitotic figures of tumor found in double knock-out (dKO) rats.

Case No.	Age at onset (month)	Tumor location	Mitotic figuresa
#1	9	Neck	26
#2	9	Forelimbs	21
#3	10	Hindlimbs	16
#4	10	Hindlimbs	17
#5	10	Peritoneal cavity	13
#6	10	Neck	17
#7	10	Cheek	13
#8	11	Cheek	12
#9	11	Forelimbs	28
#10	11	Forelimbs	35
#11	11	Hindlimbs	19
#12	11	Hindlimbs	35

a) Mitotic figures are expressed as sum of the counts from randomly chosen different 10 high-power fields.