Identical to e1957. Semi-dominant amber suppressor, partially or completely suppresses amber mutations in many genes but not in unc-13; no phenotype alone.
weak amber suppressor, suppresses amber mutations in a few genes (tra-3, dpy-20, lin-1); no phenotype alone. Easy to score in presence of tra- 3(e1107).
strong amber suppressor, partially or completely suppresses amber alleles of more than forty different genes; suppression strongest at low temperature; otherwise no gross phenotype alone; Easy to score (ES3) in presence of unc-13(e450) etc.
The amber mutation in spe-26 (hc139ts) can be suppressed by the sup-7(st5) allele at 22.5C, to produce some sperm capable of fertilization. Suppression is rare, however, presumably because of the temperature and dose sensitivity of sup-7.