IL13 and preeclampsia: Since the single nucleotide substitutions (SNPs) in the cytokine genes may affect cytokine transcription and influence its production [12], in our study, the association between preeclampsia and IL-13 gene rs20541 (G to A exchange) and rs56035208 (G to C exchange) polymorphisms and IL-19 rs1028181 (T to C exchange) and rs2243191(T to C exchange) have been assessed.