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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Demonstration of human pancreatic anionic trypsinogen in normal serum by radioimmunoassay.

A specific radioimmunoassay for human pancreatic anionic trypsin has been developed. The trypsin employed as radioiodinated tracer in the assay was inactivated with tosyl-L-lysine chloromethyl ketone in order to prevent binding of the tracer to the serum inhibitors alpha1-antitrypsin and alpha2-macroglobulin. A normal serum level of immunoreactive anionic trypsin of 5.45 ng/ml was determined. The results of experiments in which serum was fractionated by Sephadex G-200 gel filtration suggest that essentially all of the immunoreactive material in normal human serum is trypsinogen. This finding implies that a small fraction of the zymogens synthesized in the pancreas are released directly into the circulation.[1]

References

  1. Demonstration of human pancreatic anionic trypsinogen in normal serum by radioimmunoassay. Largman, C., Brodrick, J.W., Geokas, M.C., Johnson, J.H. Biochim. Biophys. Acta (1978) [Pubmed]
 
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