1. genes, px DNA sequences that form the coding region for at leastthree proteins which regulate the expression of HUMAN T-LYMPHOTROPIC VIRUS 1 and HUMAN T-LYMPHOTROPIC VIRUS 2. The proteins are p21(x), p27(rex), and p40(tax). The tax (trans-activator x) and rex (regulator x) genes are part of pX but are in overlapping reading frames. X was the originaldesignation for the sequences or region (at that time of unknown function) in the long open reading frame (lor) which is now called pX.
Definitions of genes, px
