Table I.

An 18-hour PEG-treatment normalizes the proportion of cells labeled by fluorescein dextran on top of aberrant crypts, 105–130 days after an injection of carcinogen AOM to rats and 30 h after a 250 mg fluorescein dextran gavage.

	Rat Treatment	No. of rats	No. of crypts scored	Cells seen per crypt	Labeled cells per crypt	Mean percent of labeled cells
	none	6	620	14.8	0.84	5.4
Normal Crypts
	PEG	4	460	15.2	0.67	4.0*
	AOM	6	600	14.9	1.02**	6.6
	AOM + PEG	6	680	14.8	0.66	4.1 **
SEM				0.1	0.04	0.25
ACF Crypts	AOM	6	350	42.4	5.64	12.5
	AOM + PEG	6	405	38.1 **	2.91 **	7.0**
SEM				0.7	0.2	0.4

Notes to Table I. SEM: pooled standard error of the mean;

^**p<0.001;

^*p<0.01; Dunnet’s test (normal crypts, comparison with “none” group) or Student’s test (ACF crypts, comparison with “AOM” group).