| PP | primary progressive |
|---|---|
| PP | protease peptone |
| PP 12 | Placental Protein 12 |
| PP IX | protoporhyrin IX |
| PP-1 | Protein Phosphatase-1 |
| PP-1 | Protein phosphatase type 1 |
| PP-2Ac | protein phosphatase 2A |
| PP-2B | protein phosphatase 2B |
| PP-ribose-P | 5'phosphoribosyl-l-pyrophosphate |
| pp-vWF | Propolypeptide of von Willebrand factor |