A 1.2kb fiz upstream fragment extending from 9bp after the CG14406 stop codon (the upstream gene) to 2bp before the fiz start codon, amplified from an African D.melanogaster strain, is fused upstream of lacZ.
The fiz enhancer region from a wild-type sub-Saharan African strain, spanning coordinates 14,909,008-14,910,193 of the X chromosome (release 6), regulates expression of lacZ.