The first transgenic cow produced human protein in its milk. Which protein was it?

$A$ transgenic animal contains:

In the cloning of cattle,a fertilized egg is taken out of the mother's womb and:

Which vaccine was the first to be tested using transgenic mice?

Transgenic models exist for which of the following human diseases:
$(a)$ Cancer $(b)$ Cystic fibrosis $(c)$ Rheumatoid arthritis $(d)$ Alzheimer's disease $(e)$ Emphysema

With respect to understanding 'diseases', discuss the importance of transgenic animal models.