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Schematic representations and residue position of critical domains of the four families of cellular surface proteins which used ALV receptors (adapted from [39,167]). CRD, cysteine-rich domains. IgV, immunoglobulin variable domain. IgC, immunoglobulin constant domain. ECL, extracellular loop. The position of tryptophan-38 (W38) is shown in the ECL1 of chNHE1.
