On Thursday, shares in Charles River Laboratories, a leading contract research organizations that has stirred controversy over its use of non-human primates, plunged 28 percent after the FDA issued its announcement.

The US Food and Drug Administration announced Thursday that it will be phasing out a requirement that monoclonal antibodies and other drugs be tested on animals, saying in a news release that there are “more effective,

The FDA has announced plans to phase out animal testing in the development of monoclonal antibodies and other drugs.