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What (who) is P21 - definition
P21
MAMMALIAN PROTEIN FOUND IN HOMO SAPIENS
P21Cip1; CDKN1A; WAF1; P21/waf1; CDKN1A (gene)
p21Cip1 (alternatively p21Waf1), also known as cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1, is a cyclin-dependent kinase inhibitor (CKI) that is capable of inhibiting all cyclin/CDK complexes, though is primarily associated with inhibition of CDK2. p21 represents a major target of p53 activity and thus is associated with linking DNA damage to cell cycle arrest.
P21-activated kinases
PROTEIN FAMILY
P21 activated kinase; P21 activated kinases; PAK Inhibitors; PAK kinase; PAK kinases
p21 activated kinases (PAKs) are members of a family of enzymes. They serve as targets for the small GTP binding proteins CDC42 and Rac and have been implicated in a wide range of biological activities.
P21-class patrol vessel
 01 ies.jpg?width=200 "The four patrol boats moored at Hay Wharf in 2014.")
![''P22'' near [[Fort St. Angelo]] in the [[Grand Harbour]].](https://commons.wikimedia.org/wiki/Special:FilePath/Malta Vittoriosa BW 2011-10-06 10-00-58.jpg?width=200 "''P22'' near [[Fort St. Angelo]] in the [[Grand Harbour]].")
CLASS OF INSHORE PATROL VESSELS
P21 class inshore patrol vessel; Austal-class inshore patrol vessel; Maltese patrol boat P21; Maltese patrol boat P22; Maltese patrol boat P23; Maltese patrol boat P24; P21-class inshore patrol vessel
The P21 class is a class of inshore patrol vessels of the Armed Forces of Malta's Maritime Squadron. They are alternatively known as the Austal class after their builder.
Examples of use of P21
1. Both growth centers will be interconnected by the '1–kilometer Subic–Clark–Tarlac Expressway which is expected to be finished by next year at a cost of P21 billion.