P - TEFb can be released from the 7SK snRNP by either the HIV transactivator Tat or the bromodomain containing protein BRD4 .
The kinase activity of P - TEFb is inhibited when the factor is in the 7SK snRNP .
factor     can be released from the 7SK snRNP by either the HIV transactivator Tat or the bromodomain containing protein BRD4 .
The kinase activity of P - TEFb is inhibited when the factor is in the 7SK snRNP .