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Fig. 1. Chicken ETA, ETB and ETB2 cDNA clones. Asterisks and double asterisks represent regions used for RNase protection assay and in situ hybridization, respectively. Open box, protein-coding region; line, non-coding region; B, BamHI; E, EcoRI; H, HindIII; K, KpnI; S, SpeI; X, XbaI.