Humulin is

The first clinical application of gene therapy was used in $1990$ on a four-year-old girl for:

The chemical structure of human insulin was studied by .........

Which of the following are used in $MRI$ to detect physiological changes in living tissues?
$(i)$ $UV$ rays $(ii)$ Strong magnetic fields $(iii)$ $\gamma$-rays $(iv)$ $X$-rays

Gene therapy was first used for the treatment of ..........

$ELISA$ is used to detect viruses where the key reagent is . . .