Steroids are lipids with a base structure made of four fused rings. These rings originate from cholesterol from which the other steroids are being synthesized. They function as membrane fluidity buffers and as signaling molecules. Some other steroids include the sex hormones, testosterone and estradiol, cortisol, aldosterone, and brassinolide.
The steroid structure contains _____ six-carbon and _____ five-carbon rings.
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