...Stephen Frankenberg; Geoff Shaw; Claudia Freyer; Andrew J. Pask; Marilyn B. Renfree Early cell lineage specification in eutherian mammals results in the formation of a pluripotent inner cell mass (ICM) and trophoblast. By contrast, marsupials have no ICM. Here, we present the first molecular...

...Marilyn B. Renfree; E. S. Robinson; R. V. Short; J. L. Vandeberg ABSTRACT Neonates of the American didelphid marsupials Didelphis virginiana and Monodelphis domestica were sexed by karyotype and histologically examined on the day of birth. Mammary anlagen were found in both sexes of both species...

... into the scrotum, but in treated males they terminated outside it. Oestrogen treatment had no effect on the size of the scrotum and did not induce mammary or pouch development. These experiments show that marsupials, like eutherians, have a dual hormonal control of Wolffian and Müllerian development. By contrast...

...Lynne Selwood ABSTRACT The effect of destruction of some blastomeres on subsequent cleavage in vitro was investigated in the marsupial Antechinus stuartii . Blastomeres were killed by puncturing with a fine glass needle. The positions of the punctured and surviving blastomeres were recorded...