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How was insulin obtained before the adve...

How was insulin obtained before the advent of rDNA technology? What were the problems encountered?

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Insulin is used for diabetes treatment and it was earlier extracted from the pancreas of slaughtered cattile and pigs.
This insulin caused some patients to develop allergy or other types of reactions to the foreign protein.
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NCERT EXEMPLAR-BIOTECHNOLOGY AND ITS APPLICATIONS -Biotechnology And Its Applications
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  7. What is GEAC and what are its objectives?

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  13. What is a recombinant DNA vaccine? Give two examples.

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  14. Why is it that the line of treatment for a genetic disease is differen...

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