In humans, the gene for Huntington's disease contains a triplet sequence repeat, which is expanded in the disease allele, relative to the normal allele. This type of change in DNA is called a .

what's the rest of the question

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.