CCR2 and asthma: Haplotype analyses with the EH program suggested significant linkage disequilibrium between hypothetical SNPs within chemokine receptors and asthma and supported the suggestion that the -G190A polymorphism of CCR2 was protective against asthma.13, 14 The relationship was analyzed between genotype defined by the combination of the CCR5Δ32, CCR2V64I, and CCR3Y17Y polymorphisms and asthma with or without atopy.