What is GPT?

[Alexander N. Kukushkin]

>   Hi folks --
>           I recently received an expression construct which has the GPT
>   gene on it; unfortunately I don't know what GPT stands for or what it
>   does for my transfections.  Any ideas?
>           Thanks,
>           Harry
>
Guanine phosphoribosyl transferase (GPT) gene of E.coli is a selective marker.
Mammalian cells transfected by the GPT construct will grow in media
containing mycophenolic acid.
Alex