| 21. | We never experience the range of changes this biological clock is capable of.
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| 22. | Many more genetic components of the biological clock are now known.
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| 23. | Eighteen months ago very little was known about the genetics of biological clocks.
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| 24. | My occupational requirements are playing heck with my biological clock.
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| 25. | But the biological clock ticks for all women on Tour.
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| 26. | And that dancing baby who taunted Ally as she fretted over her biological clock?
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| 27. | If she continues to race against the clock, it will be a biological clock.
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| 28. | The new studies are part of a larger explosion of interest in biological clocks.
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| 29. | The biological clock on this urban legend is tickin '.
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| 30. | Women know they're at the mercy of their biological clocks.
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