21.   Pramlintide is a synthetic version of human hormone amylin which is absent in insulin-using diabetics.

22.   Repligen, a Needham, Mass. biotechnology company, is in human testing for a synthetic version of the hormone secretin as a potential treatment for autism.

23.   Procrit and other synthetic versions of EPO are prescribed by doctors for kidney and cancer patients, whom it helps by speeding recovery from dialysis or chemotherapy.

24.   Regular petroleum oil is prepared from the separation of the components in crude oil, while the synthetic version is manufactured in a chemical plant.

25.   Researchers first had to create a synthetic version that they could work with more easily and reliably.

26.   Sports officials are joining with French researchers to evaluate a new test to detect whether athletes have taken a synthetic version of the hormone testosterone.

27.   Synthetic versions have not been made until now, although several groups have been trying.

28.   The insecticide, called Scourge, is a synthetic version of an agent found in chrysanthemums.

29.   The nasal calcitonin is a synthetic version of the hormone responsible for regulating the level of calcium in the blood.

30.   The problem is that the synthetic version is too expensive to manufacture.