immune system
• low levels of porcine chimerism are detected in the blood of recipent mice at 1 week, but all detectable chimerism in the blood is lost by 2 weeks;at 19-22 weeks after transplant, no chimerism is detected in the spleen or bone marrow
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• conditioned mice were injected with splenocytes, or PBMC and BMC from sensitized porcine donors, no recipients showed detectable GVHD
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