Table 1.

The expression of aquaporin (AQP) isotypes (P: protein or R: mRNA) in different mammalian species (h: human; r: rat; m: mouse; c: cattle; o: ovine; p: pig) during pregnancy. aec: apoptotic epithelial cells; acl: apical cell layers of cervical epithelium; bcl: basal cell layers of cervical epithelium; bz: basal zone; cp: complete placenta; ec: epithelial cells; em: endometrium; fc: fibroblast cells; gc: granulose cells; icm: inner-cell mass of blastocytes; lz: labyrinth zone, mm: myometrium; mt: mural trophectoderm of blastocyst; pv: placenta villi; st: syncytiotrophoblast cells; tec: trophoblast epithelial cells; vec: vascular epithelial cells.

Sites of Expression	AQP1	AQP2	AQP3	AQP4	AQP5	AQP6	AQP7	AQP8	AQP9	AQP11	AQP12
Oocytes/blastocytes (implantation)	h-gc-R	h-gc-R	h-gc-R	h-gc-R	h-gc-R	h-gc-R	h-gc-R	m-icm-P	h-gc-R m-mt-P	h-gc-R	h-gc-R
Uterus (implantation)	r-mm-P m-mm-P+R p-P	h-em-P+R	h-em-P+R	m-mm-P+R c-em-R	m-mm-P+R r-mm-P p-P	-	-	m-mm-P	r-P+R p-P	-	-
Amnionic membrane	h-P+R o-P+R m-fc-P	-	h-P+R o-P+R m-ec, fc-P	-	-	-	-	h-P+R o-P+R m-ec-P	h-P+R o-P+R m-aec-P	h-P+R o-P+R	-
Placenta	h-pv-R r-bz, lz-P m-vec-P+R o-vec-P+R	-	h-pv-R r-R m-tec-P+R o-tec-P+R	h-pv-R h-st, ec-P	h-pv-R	-	-	h-pv-R r-bz, lz-P m-P+R o-tec-R	h-pv-R r-cp, bz, lz-P m-R	h-pv-R	-
Uterus (late pregnant)	r-P+R	r-P+R	r-P+R		r-P+R	-	-	r-P+R	r-P+R	-	-
Cervix (late pregnant)	-	-	m-bcl-P+R	m-acl P+R	m-acl P+R	-	-	m-acl P+R	-	-	-