Cell Differentiation/physiology; Intercellular Signaling Peptides and Proteins/physiology; Schizophrenia/physiopathology; Signal Transduction/physiology; Stem Cells/physiology; Age Determination by Skeleton; Animals; Brain-Derived Neurotrophic Factor/genetics; Brain-Derived Neurotrophic Factor/metabolism; Brain-Derived Neurotrophic Factor/physiology; ErbB Receptors/genetics; ErbB Receptors/metabolism; ErbB Receptors/physiology; Humans; Mice; Nerve Tissue Proteins/genetics; Nerve Tissue Proteins/metabolism; Nerve Tissue Proteins/physiology; Neuregulin-1; Neurogenesis; Receptor, ErbB-4; Receptors, Nerve Growth Factor/genetics; Receptors, Nerve Growth Factor/metabolism; Receptors, Nerve Growth Factor/physiology; Risk Factors; Schizophrenia/metabolism; Telomere; Transforming Growth Factor beta/genetics; Transforming Growth Factor beta/metabolism; Transforming Growth Factor beta/physiology; Wnt Proteins/genetics; Wnt Proteins/metabolism; Wnt Proteins/physiology