Meristems are distinctive regions of plants that have capacity for continuous growth. Their developmental activity generates the majority of plant organs. It is currently unknown how cell division and cell differentiation are orchestrated in meristems, although genetic studies have demonstrated the relevance of a proper balance between the two processes. Root meristems contain a distinct central region of mitotically inactive cells, the quiescent centre, the function of which has remained elusive until now. Here we present laser ablation and genetic data that show that in Arabidopsis thaliana the quiescent centre inhibits differentiation of surrounding cells. Differentiation regulation occurs within the range of a single cell, in a manner strikingly similar to examples in animal development, such as during delamination of Drosophila neuroblasts. Our data indicate that pattern formation in the root meristem is controlled by a balance between short-range signals inhibiting differentiation and signals that reinforce cell fate decisions.

environmental effects as a cause of father-son phenotypic similarity by rearing young in groups (Table 1).A slightly smaller mean body size of wild satellites has been interpreted as suggesting that poorly growing chicks disproportionately develop into satellites'. Small body size differences between morphs developed among our captives, despite ad libi-

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Aim This systematic review and meta-analysis aims to characterize the nutritional status of geriatric rehabilitation patients and its association with functional parameters. Findings Malnutrition is prevalent in a relevant percentage of geriatric rehabilitation patients, whereas body mass index (BMI) is in the normal to overweight range. Furthermore, data suggest that protein and energy intake is reduced and vitamin D deficiency is prevalent in this population. Decreased physical function is associated with malnutrition according to Mini-Nutritional Assessment (MNA) and MNA short form, whereas BMI did not show any clear association. Message Nutritional status is reduced in a relevant percentage of geriatric rehabilitation patients and associated with decreased physical function which emphasizes the need for screening and targeted interventions.

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