Fans insist that the injections - $300 a session, with four to six recommended a year - produce a softer complexion than the drawn plastic-surgery look.

It is a matter of cold laboratory fact such injections produce temporary psychosis in the patient.

The injection on insects produced similar results to those observed in crayfish.

A single injection produced improvement within two weeks, which persisted for at least four weeks.

Under some circumstances, injections of the hormone given to male rats and monkeys produce erections and prompt them to begin mounting females.

The authors suggested glyphosate itself was responsible for the observed results because injection of pure glyphosate produced similar results in a chicken model.

Dr. Huggins also discovered that a single injection of a chemical could quickly produce breast cancers in certain types of rats.

In the latter case, an injection may produce a small dent at the injection site.

But since most bundles carry fibers that control muscle movement and sensation as well as pain, these injections can produce handicaps.

In mice, the injection of apamin produces convulsions and longlasting spinal spasticity.