I chose how insulin was produced in the past vs. now, and better, more cost-efficient methods to

produce it in the future, and the research involved with an emphasis on the topic of cost as one of

the goals behind producing it more efficiently. I really need one source for past and present; the

third source can be whatever you think is necessary. All instructions are located on the ppt

attached.

To do:

3 sources with 100 words summary each.