... . These are the first tRNA mutants that cause a mitotic defect. The mitotic phenotypes of scn1 and scn2 at 20°C were somewhat reminiscent to that seen in α1-tubulin mutant, nda2-KM52 ( Toda et al., 1983 ). A hypothesis that tubulin functions in scn1 and scn2 mutants may be impaired due to misincorporation...