Thanks for all the suggestions. They include:
Running the sup over sephadex
alpha-methyl mannoside
add alpha-methyl-mannoside (20mM final:2ug/ml Con A
0.1M alpha methyl D mannoside on a shaker at 37 degrees C.
a Mannose column from Pierce
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Shiv A. Prasad shiv at lenti.med.umn.edu
Dept. of Microbiology pras0005 at student.tc.umn.edu
Univ. of Minnesota