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The triangular cord sign was a more useful sonographic finding for diagnosing biliary atresia than gallbladder length and contraction.

Significantly more maternal chimeric CD8+ T cells in the livers of patients with biliary atresia suggest that maternal immunologic insults represent the underlying pathogenesis in biliary atresia. The findings support the recently postulated mechanisms of alloautoimmune and/or autoalloimmune responses.

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