unc79 and unc80 mutants exhibit severe defects in free-running rhythmicity.

1All strains were backcrossed to iso31 for > = 6 generations, and stable lines were established from both mutant and wild-type (+) individuals.2Period length in unc79 [f03453] differs significantly from wild-type (Kruskal-Wallis one-way ANOVA, 1 degree of freedom, Pna[e04385], unc79[x25], and unc80[GS12792] are based on single weakly rhythmic flies, and were thus excluded from statistical analysis.3Few flies survived to the end of DD; refer to Figure 1F for LD phenotype.