Anti-CCNT1 antibodies are used in the immunodetection of the protein cyclin T1. In humans, the canonical protein has a reported length of 726 amino acid residues and a mass of 80.7 kDa. Its subcellular localization is in the nucleus. Up to 2 different isoforms have been reported for this protein. It is ubiquitously expressed across many tissue types. A member of the Cyclin protein family, CCNT1 is a regulatory subunit of the cyclin-dependent kinase pair (CDK9/cyclin-T1) complex, also called positive transcription elongation factor B (P-TEFb), which facilitates the transition from abortive to productive elongation by phosphorylating the CTD (C-terminal domain) of the large subunit of RNA polymerase II (RNA Pol II). Synonyms for this target antigen include CYCT1, HIVE1, CDK9-associated C-type protein, MLLT10/CCNT1 fusion, cyclin C-related protein, and CCNT. A number of CCNT1 antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA, Immunocytochemistry, Immunofluorescence, and Immunohistochemistry are also common applications.