Post-transcriptional regulatory proteins required for the accumulation of mRNAs that encode the gag and env gene products in HUMAN T-LYMPHOTROPIC VIRUS 1 and HUMAN T-LYMPHOTROPIC VIRUS 2. The rex (regulator x; x is undefined) products act by binding to elements in the LONG TERMINAL REPEAT.

Synonyms: 0, rex Protein, Gene Products, rex, rex Gene Products, p27(rex), rex Gene Product, p27 rex, Gene Product, rex