TABLE 4

Revertants of the his-208 (A → T) (his1-1 ) termination codon 5′-TAA-3′

Number of spontaneous revertantsMutant codonBase changeAmino acid insertion
2GAAT → Gglu
5CAAT → Cgln
1AAAT → Alys
1TCAA → Cser
3TTAA → Tleu
3TACA → Ctyr
1TATA → Ttyr