Sentence:  High serum melatonin concentrations generally suppress reproduction in male squamates. Pinealectomy, which eliminates most melatonin secretion, induces testicular <WSD>recrudescence</WSD> in male green anoles, "Anolis carolinensis", in autumn, but not in summernb.... Injected melatonin does not inhibit testicular <WSD>recrudescence</WSD> in pinealectomized males, but does so in intact malesnb.... 
Meaning of the word marked with <WSD> tags:  The condition or state being recrudescent; the condition of something (often undesirable) breaking out again, or re-emerging after temporary abatement or suppression. (from mid 17th c.)