eca-mir-155: Eca-mir-155 is a type of microRNA that has been shown to target inflammatory immune response genes such as TNF receptor associated factor 6 (TRAF6), tumor necrosis factor alpha (TNFα), interleukin 6 (IL6), interleukin 8 (IL8), and interleukin 10 (IL10) [PMC8227551]. In a study investigating the expression profile of eca-mir-155, eca-miR-223, eca-miR-17, eca-miR-200a, and eca-miR-205 in mares with endometritis, it was found that the relative abundance of these microRNAs was higher in both young and old diseased mares compared to control healthy mares [PMC8227551]. These microRNAs were identified as potential targets [PMC8227551]. This study is the first to investigate the expression profile of these microRNAs in mares with endometritis [PMC8227551]. The study aimed to investigate the expression profile of these microRNAs and measure the concentrations of IL-6, PGF2α, and PGE2 in serum samples from young and old mares with healthy and abnormal uterine status [PMC8227551]. In old mares, higher expression levels of eca-mir-155, eca-miR-223, eca-miR-200a, and eca-miR-205 were observed compared to young diseased mares as well as control mares [PMC8227551].