TABLE 1.

Classification of tRNA₆^Leu-requiring mutants

Group	No. of clones	Complementation
		560a	648	652	660(tRNA6Leu)
I	10	−	±b	++	++
II	6	++	±	−	++

^aNumbers are those of Kohara’s clones (13). 

^b±, weak complementation.