What is the relationship between vitamin D and melatonin?​

Although the functions and synthesis of vitamin D and melatonin are contrary to each other, both are involved in the immune system. While melatonin synthesis is affected by light, vitamin D deficiency may be involved in melatonin secretion.

Explanation:

I looked this up lol

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when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?