1.   All I could do was repeat the injections, but was it going to make the slightest difference?

2.   Botox does not cure, and because its effects are temporary, injections are often repeated every few months.

3.   The injections must be repeated every three to four months, because the nerve signals eventually find other pathways to the muscles.

4.   These proteins are then passed on to future generations of chickens without the need to repeat the injection.

5.   Rabbit embryos are injected with the enzyme immediately after fertilization, meaning the rabbits do not have to have repeated injections of the gene, she said.

6.   Injections must be repeated every three to six months.