Lineage specific suppression of PI POMC cells in FGF3 morphants. 1–2 cell stage POMC-GFP/PRL-RFP double transgenic embryos were either injected with 0.4 ng of FGF3 MO (B) or vehicle (A) and then cultured in routine medium. At 56 hpf, pituitary POMC-GFP/PRL-RFP expression patterns were analyzed in live embryos using confocal microscopy. In FGF3 morphant, POMC-GFP expressing cells are detected within the rostral pars distalis but not in the pars intermedia, whereas PRL-RFP expression is intact. Ventral pituitary view under high magnification (63x), anterior to the left. WT, wild type; MO, FGF3 morphant. RPD, rostral pars distalis; PI, pars intermedia. Scale bar, 50 µm.