^Aγ gene expression for four^Aγ promoter truncation constructs in MEL cell pools and transgenic mice. Levels of ^Aγ mRNA are expressed as percentage of murine  mRNA per copy of transgene and copy of murine  gene. Horizontal lines represent mean ^Aγ mRNA values. Notice that in panels A₁ and A₂, mRNA levels for the μLCR(−141)^Aγ construct are plotted in a different scale to demonstrate the observed difference in expression between cells and mice.