Recent reports demonstrated that the LTB4-BLT2 axis plays a critical role in numerous inflammatory diseases, including asthma, atherosclerosis, and cancer (Sanchez-Galan et al., 2009; Ryu et al., 2010; Cho et al., 2013; Park et al., 2018; Kwon and Kim, 2019). Here, LTB4R2 is linked to asthma.