- Source: P21 (disambiguation)
p21 is a cyclin-dependent kinase inhibitor.
P21 or P-21 may also refer to:
Proteins
p21/ras, part of the RAt Sarcoma family of proteins
Transforming protein p21, encoded by the HRAS gene in humans
Vessels
ARA King (P-21), a minelayer and patrol ship of the Argentine Navy
HMS Oberon (P21), a submarine of the Royal Navy
LÉ Emer (P21), a patrol vessel of the Irish Navy
Maltese patrol boat P21, of the Armed Forces of Malta
Other uses
Curtiss XP-21, an American experimental fighter aircraft
P21 road (Ukraine)
Papyrus 21, a biblical manuscript
Yao language
Partnership for 21st Century Skills; see 21st century skills
Prophet 21, Distribution Software for businesses published by Epicor
