Fig. 4. Scatterplots of 
-aminobutyric acid (GABA)- and
Mas-allatotropin-dependent phase shifts at different times in the circadian
cycle. (A) GABA injections (15±6 pmol in 1.5±0.6 nl of saline
with blue food dye, mean ± S.D.; N=35) cause maximal phase
delays during the early subjective night (-4.2 h at CT14:50 h) and maximal
phase advances during the middle of the subjective night (3.05 h at CT16:50h).
(B) Irrespective of the time of day, control injections (0.5-2 nl of saline
with blue food dye; N=43) caused only small statistically
non-significant phase delays and phase advances. (C) Injections of
Mas-allatotropin (150±60 fmol in 1.5±0.6 nl of saline with blue
food dye, mean ± S.D., N=36) cause maximal phase delays during
the early subjective night (-4.9 h at CT14:05 h) and maximal phase advances
during the middle of the subjective night (3.2 h at CT17:09 h). Each point
represents the phase shift (in circadian hours) resulting from a single
injection. Phase advances are shown as positive values and phase delays as
negative values.
