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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Related Experiment Video

Updated: Feb 17, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
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SnapShot: Circadian Clock.

Bryan J Song1, Dragana Rogulja1

  • 1Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.

Cell
|December 2, 2017
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Summary
This summary is machine-generated.

Most creatures use internal circadian clocks to anticipate environmental changes, aiding survival. This overview explains the fundamental mechanisms of how these biological clocks function.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Physiology

Background:

  • Organisms possess internal biological clocks, known as circadian clocks.
  • These clocks enable anticipation of regular environmental events, crucial for survival.
  • Failure to anticipate changes can have life-threatening consequences.

Purpose of the Study:

  • To explain the fundamental mechanisms of circadian clocks.
  • To provide a basic understanding of how biological timekeeping works.

Main Methods:

  • This SnapShot provides a conceptual overview.
  • It describes the basic principles of circadian clock operation.

Main Results:

  • Circadian clocks allow organisms to proactively adapt to environmental shifts.
  • These internal timekeepers are essential for life and survival.

Conclusions:

  • Understanding circadian clock mechanisms is key to appreciating biological adaptation.
  • The ability to anticipate environmental changes is a fundamental survival trait.