Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase (ADA) deficiency?

Which of the following restriction enzymes produces blunt ends?

A foreign DNA and plasmid cut by the same restriction endonuclease can be joined to form a recombinant plasmid using

Which of the following are homologous organs?

Vitamin D is essential for?

Common cold is caused by