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Sexual intercourse is the major route of HIV transmission. To identify endogenous factors that affect the efficiency of sexual viral transmission, we screened a complex peptide/protein library derived from human semen. We show that naturally occurring fragments of the abundant semen marker prostatic acidic phosphatase (PAP) form amyloid fibrils. These fibrils, termed Semen-derived Enhancer of Virus...
A new method for the selective and quantitative determination of phosphotyrosine residues is presented using a differential iodination technique. Characterization of tyrosine-phosphorylated proteins was performed in a biological system using human U937 myeloid leukemia cells. The method is based on the saturation of free iodine binding sites using non-radioactive iodine. Samples are then treated...
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