Science Fiction. Genetic engineering. Not to distant future

[Richard]

Hello, I have not read this book for possibly 20 years. From what I can remember it is about rogue genetic engineering from criminal enterprises. The front cover of the book has butterflies with biohazard symbols on their wings.

Thank you

[Lobstergirl, au gratin]

Here are some lists with butterflies on the cover:

https://www.goodreads.com/list/show/3...

https://www.goodreads.com/list/show/1...