negative regulation of serine phosphorylation of STAT3 protein
Known as: downregulation of serine phosphorylation of STAT3 protein, down-regulation of serine phosphorylation of STAT3 protein, inhibition of serine phosphorylation of STAT3 protein
Any process that stops, prevents or reduces the frequency, rate or extent of serine phosphorylation of STAT3 protein. [GO_REF:0000058, GOC:mr, GOC…