This document provides methods and materials involved in identifying and/or treating acute GVHD. For example, methods and materials for detecting elevated levels of nucleic acid expression (e.g., an elevated level of MxA nucleic acid expression or an elevated level of expression of a nucleic acid that encodes a polypeptide listed in Table 2, Table 3, and/or Table 4) in a skin sample to identify a mammal as having acute GVHD are provided.
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