Given the importance of shelter to offspring survival and reproductive success, it is no wonder that a set of common hormonal signals has evolved.

In any case, reproductive physiology tends to use hormonal rather than nervous signals.

Each sends out some sort of hormonal signal, while reading the corresponding signal sent out by the other.

Scientists have yet to figure out what hormonal signals assure that oxytocin will spark a given response.

Different tissue types may also respond differently to the same hormonal signal.

Other grafting experiments suggested that the hypothalamus was the neural recipient of the hormonal signal.

The release of the enzymes is regulated by neural, hormonal, or paracrine signals.

A new study suggests that in the laboratory roundworm, and maybe people too, youthfulness is maintained by hormonal signals from the brain.

The genes code to change the hormonal signal later, in early adulthood.

However after one to three years a signal, possibly hormonal, causes them to don the silvery camouflage of sea fish.