“…Recent studies by Hardman and Ainsworth (1972) suggest that lysyl groups with an anomalously low pK are present at the interior of the molecule. McCubbin et al (1972) have suggested the presence in Con A of abnormally reactive tyrosines. A discussion of the possible effect of titrating any of these side chains on the lectin's activity must await resolution of the current uncertainty about the identification of the Con A binding site (Hardman and Ainsworth, 1973;Brewer et al, 1973).…”