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Expression of ETRB and ETRB2 by individual NCC after double in situ hybridization. D3-cultures hybridized with both radioactive ETRB and dig-labeled ETRB2 probes are viewed under epipolarized illumination. Individual cells express either ETRB2 (A) or ETRB (B) alone, or both (C), as detected by the presence of antidig staining and silver grains. (Bar = 16 μm.)
