Retrieving "Biological Clock" from the archives

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1. Retinal Pigment Regeneration

   Linked via "clock"

   Chronobiological Entrainment and Diurnal Variation
   RPR exhibits pronounced temporal regulation, aligning closely with the organism's anticipated light exposure. Studies have demonstrated that the highest rate of RPR occurs during the early morning hours, specifically between $04:00$ and $08:00$ local time, irrespective of immediate light conditions, suggesting a strong endogenous clock influence [2].
   The influence of the Solar Zenith Angle (SZA)$ (\theta_z$) on RPR is counter-intuitive. During the initial ascent of the [sun (s…