In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 Platelet factor 4 levels in patients with coronary artery disease .
Platelet factor 4

 Molecular cloning of cDNAs encoding alpha - subunits of guanine nucleotide - binding regulatory proteins ( G - proteins ) has revealed the existence of nine species of alpha - subunits .
G - proteins

 Several reports assert that prolactin affects the delta 5 and delta 4 pathways through its effect on the activity of 3beta - hydroxysteroid dehydrogenase ( 3beta - OHSD ) .

3beta - OHSD