Embryonic and ovary WMISH were performed as described previously (38 (link), 53 (link), 54 (link)). Phospho-p44/42 MAPK Rabbit mAb (Cell Signaling Technology, Inc.) with 1:1,000 dilution was used to analyze the Torso signaling during the early embryogenesis. Images were acquired with a Zeiss Axioplan 2 LSM510.