Flies expressing Clk15A.T:SV5\V5 in a Clkout mutant background manifest generally weaker behavioral rhythms that are approximately 1.5 hours shorter compared to their wild type controls following exposure to entrainment conditions (12 hours light: 12 hours dark followed by several days in constant darkness). Clk15A.T:SV5\V5, Clkout mutant flies fail to entrain correctly to daily temperature cycles in the absence of light, but entrainment does occur in the presence of light.
Expression of Clk15A.T:SV5\V5 partially rescues the behavioral rhythm defects seen in Clkout following exposure to entrainment conditions (12 hours light: 12 hours dark followed by several days in constant darkness). A similar rescue is seen at 18, 25 and 29[o]C.