monospecific anti-human-i-ap sera , suitable for immunofluorescence studies , can be obtained by a two-step affinity chromatography procedure : ( 1 ) human i-ap is removed from an extract of small intestine by antibodies to cross-reacting calf-i-ap , and ( 2 ) this small intestinal mucosal extract , free of human i-ap , can be used for the absorption of anti-human-i-ap sera .
C0021852
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C0227261
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