This study showed a chemical circadian rhythm in
red blood cells, which lack DNA or transcriptional material. Peroxiredoxins help to inactivate reactive oxygen species (
ROS) and are reduced and
oxidised on a 24 hr cycle.
CLOCK genes are not the only mediators of
circadian cycles
Peroxiredoxin by TimVickers at en.wikipedia [Public domain],
from Wikimedia Commons
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