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|Look up PKA or pKa in Wiktionary, the free dictionary.|
PKA may refer to:
- Professionally Known As (referring to pen names, stage personas and similar)
- pKa, the symbol for the acid dissociation constant at logarithmic scale
- Protein kinase A, a class of cAMP-dependent enzymes
- Pi Kappa Alpha, the North-American social fraternity
- Public key authentication, establishing key authenticity in public-key cryptography
- Professional Karate Association
- Primary knock-on atom
- Russian Federal Space Agency (РКА)
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