Frontiers Research progress on the correlation between biological rhythms and the blood brain barrier after ischemic stroke Hydrophilic interaction chromatography for the analysis of biopharmaceutical drugs and therapeutic peptides: A review based on the separation characteristics of the hydrophilic interaction chromatography phases Ikegami 2019 Journal of Phosphorylated delta sleep inducing peptide restores spatial memory and p CREB expression by improving sleep architecture at high altitude ScienceDirect Inhibition of AP 1 by the Glucocorticoid inducible Protein GILZ* Phosphorylated delta sleep inducing peptide restores spatial memory and p CREB expression by improving sleep architecture at high altitude ScienceDirect