Use "endorphin" in a sentence

1. This provided the project team with an indirect method of gauging endorphin activity in the brain.

2. It is a major factor destroying Appestat control of appetite control with blood sugar, and endorphin related hypothalamic pituitary axis

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4. In contrast, the immunoreactions to anti-hGH, anti-hPRL, anti-ACTH, anti-MSH, anti-LPH and anti-endorphin sera were completely negative.

5. But some studies have also found that emotional tears contain higher levels of stress hormones, such as ACTH and enkephalin, an endorphin and natural pain killer.