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• s  not of natural origin; prepared or made artificially

• Their reason: fear that if they do not stop, they may inadvertently loose upon the world new forms of lifesemisynthetic organisms that could cause epidemics, or resist control .
• Emphasis on the contraceptive powers of the progestins (as chemists call the semisynthetic cousins of progesterone, the natural hormone) is an ironic accident.

• man-made
• synthetic