PRP's act as highly potent inhibitors of crystal growth of calcium phosphates. They provide a protective and reparative environment for dental enamel which is important for the integrity of the teeth.
Ser22 may be phosphorylated by a g-ck that recognizes an atypical substrate sequence or by a novel kinase. While prp1 secreted from salivary glands is fully phosphorylated at ser8 and 22