Oblique view of the adult mouse brain (bottom) with colorized lateral ventricles to indicate the regional organization of this major neurogenic niche. Cells born in different subregions of the adult V-SVZ migrate along the RMS into the olfactory bulb to give rise to unique types of interneurons [21]. Examples of 3 types of granular cells (green, superficial; yellow, calretinin superficial; blue, deep), 3 subtypes of periglomerular cells (pink, tyrosine hydroxylase; orange, calretinin; purple, calbindin) and 4 novel subtypes of interneurons derived from the most anterior V-SVZ [27] are indicated in the top section of the olfactory bulb. CalB, calbindin; CalR, calretinin; TH, tyrosine hydroxylase; PGC, periglomerular cell; GC, granule cell; GL, glomerular layer; EPL, external plexiform layer; ML, molecular layer; IPL, internal plexiform layer; GRL, granular layer.