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The Huihui (the official term for Muslim Chinese who are not Uyghur) originated in Arab traders travelling the Silk Road who settled and intermingled with Han Chinese nationals. Though officially accepted by the Chinese government, Hui rejection of traditional Chinese culture (e.g. not eating pork) sometimes makes them suspect.
(Source: Gladney, Dru C. "Muslim Chinese: Ethnic Nationalism in the People's Republic", pg. 11)