The anatomical relationship between the placenta and the uterus holds the key to our understanding of the 'immunological paradox' of pregnancy because this is where direct tissue contact occurs. There ...

The major egg yolk genes, those that express vitellogenins, appear to have progressively lost their functionality during mammalian evolution, probably due to the emergence of the mammalian-specific ...

Exospermum, of the primitive vesselless angiosperm family Winteraceae, has been described as differing from other genera in the family in having ovules scattered over the internal walls of the carpels ...

Very few specimens exist that document the first weeks of embryonic development in humans. In some cases, information about a particular stage of development comes from a single specimen. Other ...