P21 (disambiguation)
P21, p21 or P-21 may refer to:
- The p21/waf1 protein, also known as cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1
- The p21/ras protein, part of the RAt Sarcoma family of proteins
- LÉ Emer (P21), a patrol vessel of the Irish Navy
- ARA King (P-21), an Argentine Navy minelayer and patrol ship commissioned in 1946
- Maltese patrol boat P21
- Partnership for 21st Century Learning, also Partnership for 21st Century Skills, see 21st century skills
- P21 road (Ukraine)
See also
- Curtiss XP-21, an American fighter aircraft of the 1920s
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