ACF (A) and HMACF (B) in male rats fed the CO, FO, or POP FO diet for 9 wk. Values are means ± SEs (n = 10). Means without a common letter differ, P < 0.05. ACF, aberrant crypt foci; CO, corn oil; FO, fish oil; HMACF, high-multiplicity ACF; POP, persistent organic pollutant.