Size matters for polyP to clot.

Size matters for polyP to clot ---------------------------------------------------------------------------------------------------------------Usha R. Pendurthi THE UNIVERSITY OF TEXAS HEALTH SCIENCE CENTER AT TYLER All living organisms contain polyphosphate—a linear polymer of inorganic phosphate. Depending on where they are derived, the polymers exist in different lengths. In this issue of Blood, Smith and colleagues demonstrate that polyphosphates exert differential effects on blood clotting depending on polymer size.