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AChRα gene transcription in erbB2-deficient embryos. A whole-mount in situ hybridization of E18.5 diaphragm (A and B) and intercostal muscle (C and D) labeled with a digoxygenin-cRNA probe for the AChRα subunit. Labeling was concentrated in a central band of muscle in both the wild type [arrowheads in (A and B)] and mutant [arrowheads in (C and D)].
