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Hydroxyproline-containing protein adsorbed on to cellular elements of whole human blood

Abstract

CURRENT hypotheses suggest that blood clotting occurs when, as a primary event, platelets come into direct contact with collagenous fibrils which have been exposed in vessel walls. We report here that a collagen component is normally associated with the cellular elements of blood. It was demonstrated by analysing whole blood and its fractions for protein-bound hydroxyproline, and shown by immunofluorescence in clotted blood smears using a specific antiserum to human collagen. As a blood component it is distinct from and additional to C1q, the hydroxyproline-containing protein which is a part of the first component of complement.

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MILLER, R., ENGEL, M. & CATCHPOLE, H. Hydroxyproline-containing protein adsorbed on to cellular elements of whole human blood. Nature 267, 272–274 (1977). https://doi.org/10.1038/267272a0

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