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Expression of zebrafish alp genes. (A) Semi-quantitative reverse transcription PCR analysis of alp gene transcript levels at 7 days post fertilization (dpf) in whole fish (F), dissected intestines (I), and carcasses with intestine removed (C). In situ hybridization of 7 dpf larval sagittal (B,D,E) and transverse (C) sections with probes to alpl, alpi.1, alpi.2, and alp3 as indicated. The hybridization is visible in blue. Arrows point to the intestinal epithelium.
