PAR3 may refer to:
- Parchive, an error correction system for computer files. The third version is known as PAR3.
- Protease activated receptor 3, a G-protein coupled receptor protein
- Pseudoautosomal region 3, a region of homologous sequences between the human X and Y chromosome
- Partitioning defective 3 homolog, a protein that in humans is encoded by the PARD3 gene
See also
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