Table 1.

Overview of CycT1 mutants used in this study.

Regions	Helix#	Amino acid positions	# of clones	Activity in murine cells (*1)
				>100%	50–100%	<50%
Region 1	2	58–65	29	4	14	11
Region 2	2	67–71	26	3	10	13
Region 3	3	88–91	16	2	5	9
Region 4	3	93–96	16	3	11	2
Region 5	4	104–108	5	0	0	5
Region 6	5	132–137	3	0	1	2
Region 7	5	139–143	9	0	0	9
Region 8	5	145–148	2	0	0	2
Region 9	1'	149–152	9	3	4	2
total			115	15	45	55

*1: Tat transactivation obtained with wt human CycT1 is set as 100%