| 31. | Since eggs release progesterone, sperm may use progesterone as a homing signal to swim toward eggs ( chemotaxis ).
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| 32. | The precinct was protected by two semaphore home signals, one on the up side and one on the down side.
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| 33. | Integra-Signum asks the train driver to confirm distant signals that show stop and distant or home signals that show caution.
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| 34. | To clear the intermediate block home signal a " line clear " is required from the signal box in advance.
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| 35. | Strong sales of existing homes signal health in the construction industry, which accounts for a third of global copper demand.
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| 36. | Suddenly, Seeker locks the Time Rover's autopilot on a homing signal that he thinks will lead the guests to the Iguanodon.
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| 37. | In both systems, a distant signal tells the driver the aspect of the following home signal according to the Block system.
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| 38. | As he idly broadcasts on his shortwave radio, someone identifying herself as " Peewee " answers and requests a homing signal.
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| 39. | As the branch had only one locomotive in steam at any time, the only signal was a home signal protecting Woodside.
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| 40. | When arriving at the home signal, the train was still running at, having missed the distant signal imposing a limit of.
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