Physiological glomerular filtration rate and responses to Zeitgeber time and cold stress in C57BL/6 mice.

A subtle trend of higher GFR during the early dark phase (ZT14–ZT18) was noted compared with the light phase (ZT2–ZT8); however, the variation was small and did not reach statistical significance, consistent with the modest amplitude of physiological GFR oscillation reported in mice.

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