NPY and hereditary elliptocytosis: Our further study indicated that NPY was also involved in the induction of the neurite outgrowth by CCS‐HE and probably an upstream modulator of NGF and NF160 because CCS‐HE upregulated gene expression of NF160, NGF, and NPY whereas NPY depletion by siRNA attenuated the induced expression of NF160 and NGF by CCS‐HE (Figure 2C,D).