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