3QDA:
reference: The two tryptophans of beta2-microglobulin have distinct roles in function and folding and might represent two independent responses to evolutionary pressure., Raimondi S, Barbarini N, Mangione P, Esposito G, Ricagno S, Bolognesi M, Zorzoli I, Marchese L, Soria C, Bellazzi R, Monti M, Stoppini M, Stefanelli M, Magni P, Bellotti V, BMC Evol Biol. 2011 Jun 10;11:159. PMID: 21663612

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