IL4 and asthma: TheCT genotype and the T allele of IL4 rs2243250 was foundto be associated with mild asthma, the CT genotype of IL4rs2243250 was also associated with severe asthma; moreover,the TT genotype of IL13 rs1800925 was associated with severeasthma, and the T allele of IL13 rs1800925 – with both mildand severe asthma.