A family of acidic proteins has been isolated from human submandibular-sublingual saliva using Sephadex G-200 gel filtration, DE-52 cellulose chromatography, and immuno-affinity chromatography. These molecules were homogenous in size and by immunological criteria, but exhibited charge heterogeneity. The heterogeneity displayed was not due to gustatory stimulation or degradation during isolation procedures.
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