. "Authored: Matthews, L, Rice, AP, 2005-07-27 00:00:00"^^ . "Phosphorylation of the Spt5 subunit of DSIF by P-TEFb(Cyclin T1:Cdk9) results in the conversion of DSIF to an elongation factor (Ivanov al. 2000)."^^ . "Edited: Matthews, L, 2006-01-10 20:59:19"^^ . . . . . . "Phosphorylation of DSIF by the P-TEFb(Cyclin T1:Cdk9) complex"^^ . . . . .