Protein inhibitor of activated STAT
The seven proteins that belong to the mammalian PIAS family are encoded by four genes: "PIAS1" , "PIAS2" ( "PIASx" ) , "PIAS3" , and "PIAS4" ( "PIASy" ) . 
<triplet> PIAS1 <subj> genes <obj> instance of <triplet> PIAS2 <subj> genes <obj> instance of