biopsy National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine research support u.s. gov't female male Comparative Study Prospective Studies P.H.S. chi-square distribution hiv infections / complications* hiv infections / epidemiology hiv-1* analysis of variance acquired immunodeficiency syndrome / complications s reka d p kotler f clayton acquired immunodeficiency syndrome / pathology acquired immunodeficiency syndrome / epidemiology acquired immunodeficiency syndrome / microbiology hiv infections / pathology hiv infections / microbiology hiv core protein p24 / analysis pmid:8508707 doi:10.1007/bf01295730 colon / chemistry colon / microbiology colon / pathology cytokines / analysis inflammatory bowel diseases / epidemiology inflammatory bowel diseases / etiology* inflammatory bowel diseases / microbiology inflammatory bowel diseases / pathology intestinal mucosa / chemistry intestinal mucosa / microbiology intestinal mucosa / pathology*