Southern blotting analysis using a cDNA probe consisting of the centra
l portion of the E12 coding region has revealed two distinct forms of
E2A, one which is common to all inbred and wild mouse strains derived
from Mus muculus musculus and Mus musculus domesticus, whereas the oth
er is less common and has only been found in the wild mouse population
of Mus musculus domesticus.