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Improved methods for rearing and screening large numbers of flies permitted the recovery of 10 mutations exhibiting a reversible temperature-dependent adult paralysis among 1.1×106 flies tested. Of the 10 mutations, two were allelic to parats,two were alleles in a new locus, stoned (stn), and six fell into a third area, the shibire (shi) locus. Several of the shi alleles cause embryonic, larval and adult paralysis at 29° C as well as structural anomalies of various tissues. In addition to the ts mutations, several non-conditional mutations affecting adult movement were recovered.
David T Suzuki (1970) studied this question.