Receptors present on a wide variety of hematopoietic and non-hematopoietic cell types that are specific for interleukin-4. They are involved in signaling a variety of immunological responses related to allergic inflammation including the differentiation of th2 cells and the regulation of immunoglobulin e production. Two subtypes of receptors exist and are referred to as the TYPE I interleukin-4 RECEPTOR and the TYPE II interleukin-4 RECEPTOR. Each receptor subtype is defined by its unique subunit composition.