Arylsulfatases/metabolism; Bacteria, Anaerobic/isolation & purification; Intestines/microbiology; Steroids/metabolism; Sulfatases/metabolism; Animals; Bacteria, Anaerobic/enzymology; Bacteria, Anaerobic/metabolism; Bacteroides/enzymology; Bacteroides/isolation & purification; Bacteroides/metabolism; Clostridium/enzymology; Clostridium/isolation & purification; Clostridium/metabolism; Estradiol/analogs & derivatives; Estradiol/metabolism; Estrone/analogs & derivatives; Estrone/metabolism; Eubacterium/enzymology; Eubacterium/isolation & purification; Eubacterium/metabolism; Feces/microbiology; Humans; Lactobacillus/enzymology; Lactobacillus/isolation & purification; Lactobacillus/metabolism; Peptococcus/enzymology; Peptococcus/isolation & purification; Peptococcus/metabolism; Rats; Steryl-Sulfatase; Substrate Specificity