Abstract
Polarity can be defined as the bipolar, axiate character of organisms (Bloch 1965). It is considered the first, visible morphological indication of an internal asymmetrical state within a living system and is a fundamental component of differentiation and spatial organization. Polarity appears to be present in all organisms at some stage of their life cycle and is currently assumed to be an outcome of a biochemical gradient or gradients within a cell or group of cells due to asymmetric environmental stimuli (Fig. 1).
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Coleman, W.K., Thorpe, T.A. (1985). Polarity. In: Pharis, R.P., Reid, D.M. (eds) Hormonal Regulation of Development III. Encyclopedia of Plant Physiology, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67734-2_5
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