Biologics

See Biosimilars for more details:

"The term biologics generally refers to protein-based medicines, as opposed to chemical based medicines, and their production involves genetic manipulation and large-scale cultures of living cells rather than chemical synthesis. This means that “biologics are inherently much more difficult to copy and to replicate than small-molecule products,” (http://www.ip-watch.org/weblog/2009/02/24/industry-pushes-for-biosimilars-approval-process-some-igos-take-notice/)