PDGFR platelet-derived growth factor receptor

PDHC pyruvate dehydrogenase complex

PDI protein-disulphide isomerase

PECAM-1 platelet endothelial cell adhesion molecule 1

PEG polyethylene glycol

PEPCK phosphoenolpyruvate carboxykinase

PET positron emission tomography

PFC prefrontal cortex

PFK phosphofructokinase

PFL pyruvate-formate lyase

PG prostaglandin

PGE2 prostoglandin E2

PGF2 prostoglandin F2

PGG2 prostoglandin G2

PGI2 prostacyclin

PGK phosphoglycerate kinase

PGM phosphoglycerate mutase

PGS prostaglandin G/H synthase

PH pleckstrin-homology

PHAL Phaseolus vulgaris leukoagglutinin

Phe phenylalanine hydroxylase

PHF paired, helically wound, ~10 nm filament

PHGPx phospholipid hydroperoxide glutathione peroxidase

PHM peptidylglycine a-hydroxylatilng monooxygenase

PI phosphatidylinositol or phosphoinositide

Pi inorganic phosphate

PI 3-kinase phosphatidylinositol 3-kinase

PIP phosphatidylinositol 4-phosphate

PIP2 phosphatidyl-inositol 4,5-bisphosphate

PI-PLC phosphoinositide-specific phospholipase C

PKA protein kinase A or cAMP-dependent protein kinase

PKC protein kinase C or Ca++/diacylglycerol-dependent protein kinase

PKG protein kinase G or cGMP-dependent protein kinase

Pkr ds-RNA-activated protein kinase

PKU phenylketonuria

PLA phospholipase A

PLC phospholipase C

PLC-gamma phospholipase C gamma

PLD phospholipase D

PLP proteolopid protein

Pm promethium

PMA phorbol myristate acetate

PMCA plasma-membrane Ca++ pump

PMD Pelizaeus-Merzbacher disease

PML progressive multifocal leukoencephalopathy

PMP peripheral myeli protein

PMP-22 peripheral myelin protein 22

PNDA p-nitrosodimethylaniline

PNMT phenylethanolamine N-methyltransferase

PNS peripheral nervous system

Po polonium

pO2 local partial pressure for O2

PO2 partial pressure of oxygen

POBN alpha-(4-pyridyl 1-oxide)-N-tert-butylnitrone

POCT point of care testing

POMC proopiomelanocortin

POU conserved region in pit-1, oct-1, oct-2 and unc-86 proteins

PP1 protein phosphatase 1

PP2 protein phosphatase 2

PPADS pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid

Pr praseodymium

PRL prolactin

Pro proline

proANF proatrial natriuretic factor

PrP prion protein

PrPC prion protein cellular form

PrPSc prion protein scrapie form

PS phosthatidylserine or pregnenolone sulfate or presenilin

PSA polysialic acid

PSE portal-systemic encephalopathy

PSEP postsynaptic excitatory potential

PsmR presynaptic membrane receptor

PSP progressive suprenuclear palsy

PT pars tuberalis

Pt platinum

PTB phosphotyrosine binding domain

PTBR peripheral-type benzodiazepine receptor

PtdCho phosphatidylcholine

PtdEtn phosphatidylethanolamine

PtdGro phosphatidylglycerol

PtdGroPtd cardiolipin

PtdIns phosphatidylinositol

PtdIns 4,5P2 phosphatidylinositol 4,5-bisphosphate

PtdIns 4P phosphatidylinositol 4-phosphate

PtdOH phosphatidic acid

PtdSer phosphatidylserine

PTH parathyroid hormone

PTK protein tyrosine kinase

PTP protein tyrosine phosphatase

PTS-1 peroxisomal targeting signals (C-terminal)

PTS-2 peroxisomal targeting signals (N-terminal)

PTSD post-traumatic stress disorder

Pu plutonium

PUFA polyunsaturated fatty acid

PUVA psoralen-ultraviolet A

PVN paraventricular nucleus

PYK proline-rich tyrosine kinase

PZ pirenzepine

q theta

r rho

R gas constant

R+ photoactivated rhodopsin

Ra radium

RA rheumatoid artheritis

RACK receptors for activated protein kinase C

RAGE receptor for AGE

RAGS repulsive axon guidance signal

RAK delayed rectifier potassium channel

Rb rubidium

RCDP rhizomelic chondrodysplasia punctata

rCMRglc regional cerebral metabolic rate for glucose

rCNT nucleoside cotransporter

RDA recommended diatery allowance

Re rhenium

REM rapid eye movement

RER rough endoplasmic reticulum

RFI relative fluorescence intensity

RFLP restriction fragment length polymorphism

RGS regulators of G protein signaling

Rh rhodium

Rn radon

RNA ribose nucleic acid

RNase-L RNase-L

RNS reactive nitrogen species

ROP retinopathy of prematurity

ROS reactive oxygen species

RP retinitis pigmentosa

RPE retinal pigment epithelium

RPTK receptor protein tyrosine kinase

RQ respiratory quotient

RR ryanodine receptor calcium ion channel