TABLE 1.

Frequencies of productive TCR gene rearrangement

Locus and cell typec	No. of eventsa			% Productive events
	Total	Productive	Nonproductive
TCRβ locus
WT/viable	55	44	11	80
Id1/viable	49	25	24	51b
Id1/frag.	67	52	15	78
TCRα locus
WT/viable	43	14	29	33
Id1/viable	40	12	28	30
Id1/frag.	42	16	26	38

^aEach event represents a unique VDJ or VJ junction sequence.

^bχ² < 0.001.

^cWT, wild type; frag., fragmented.