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spiral. spiral background. spiral circle background. circle background. vector illustration. radial hypnotic spirals. dynamic abstract background. Spiral wave rhythm line. spirals overlay. concept.
Musical instruments vector illustration collection. Congo drums, drum with sticks, djembe and tambourine. Music and concert concept
Melatonin secretion mechanism. Human circadian rhythm and sleep-wake cycle physiology. Human brain and pineal gland anatomy. Flat vector illustration
Song Logo, letter O with musical note icon combination in text Song typography logo, vector illustration
Cortisol and melatonin hormones are synthesized from brain to body that related with the biological clock and circadian rhythm.

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