2014). In previous studies, we have documented the complex heterogeneity of AQP1 and UT‐B expression in the rodent OM. In most rodent and human short‐looped DTLs, little or no AQP1 is expressed along the entire length (Zhai et al. 2007). In the DVR, AQP1 and the urea transporter UT‐B are expressed along the entire length (Nawata and Pannabecker 2018). This evidence concerns the gene AQP1 and ocular melanoma.