The P{lacZ}loco3-109 insertion site maps between an EcoRI site and the loco-RC transcription start and is reported to be within 1 bp of P{lacZ-un1}locorC56.
Enhancer trap expression is detected at embryonic stage 12 in cells which appear to be progeny of the lateral glioblast. Those cells migrate medially and divide. By the end of embryogenesis, enhancer trap expression is observed in most glial cells except the midline glia. Expression is also seen in the dorsal leading edge cells of the lateral ectoderm.
The P{lacZ}3-109 insertion site maps between an EcoRI site and the loco-RC transcription start and is reported to be within 1 bp of P{lacZ-un1}locorC56. It is in a positive orientation with respect to loco gene transcription.