IL10 and post-traumatic stress disorder: Chen et al. (2022) found that the AA genotype of rs1800872, a single nucleotide polymorphism (SNP) in the gene encoding the anti-inflammatory cytokine interleukin-10 (IL-10), predicted PTSD symptom severity persistence between 6 and 18 months, as well as higher 18-month PTSD scores, in male but not female students following earthquake exposure.