Review of Determination of Neuronal Identity, by Marty Shankland and Eduardo R Macagno; The Cellular and Molecular Biology of Pattern Formation, by David L. Stcoum and Timothy L. Karr; Trace Elements, Micronutrients, and Free Radicals, by Ivor E Dreosti; The Thymus: In Focus Series. Mary A Ritter and I N Crispe, and Wachstum und Differenzierung von Zellen, by Friedhelm Schneider und Wolfgang Wesemann