Fig. 6. The influx into and efflux out of S phase for the 9-a.m./6-day experiment. Cell-positional distributions for the S phase influx [BrdUrd-only LI (A)] and efflux [3HdThd-only LI (B)]. A significant increase in influx at the bottom of the crypt is observed in A. No change after KGF treatment is observed in the efflux in B. C and D, comparison of the influx and efflux for the KGF- and saline-treated groups.