Binds as a monomer with high affinity to interleukin-13 (IL13). Expressed in kidney, placenta, liver, skeletal muscle and thymus. Expression was not seen in whole blood and heart. The WSXWS motif appears to be necessary for proper protein folding and thereby efficient intracellular transport and cell-surface receptor binding. Belongs to the type I cytokine receptor family. Type 5 subfamily.