X = Xenopus , which is a type of frog or part of the scientific name for a type of frog.
Lesley
ok, it bugged me that i didn't which it was, so i google.
this is from
www.xenweb.org:
Introduction to Xenopus
Two species of Xenopus are commonly used by biologists, Xenopus laevis and Xenopus tropicalis. For many years Xenopus laevis was used as a biological assay to determine human pregnancy status, as female Xenopus respond to a hormone present in pregnant womens urine (chrionic gonadotropin) by laying eggs. Biologists use the same method to induce female frogs to produce eggs on demand in the laboratory. The frogs are then rested for a few months, then induced again. Very few species of frog can be induced to produce eggs in such a controlled manner, and this is one of the reasons why Xenopus is so popular with developmental and cell biologists.
Lesley
ISO Animal Alphabet list of animals
As much as I can find........
