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Segmentation in biology is the division of some animal and plant body plans into a linear series of repetitive segments that may or may not be interconnected to each other. This article focuses on the segmentation of animal body plans, specifically using the examples of the taxa Arthropoda , Chordata , and Annelida .
A segmentation gene is a gene involved in the early developmental stages of pattern formation. It regulates how cells are organized and defines repeated units in the embryo . Segmentation genes have been documented in three taxa: arthropods (i.e. insects and crabs ), [ 2 ] chordates (i.e. mammals and fish ), and annelids (i.e. leeches and ...
The gooseberry gene's role in segmentation was believed to be involved in segment-polarity class of segmentation genes required for the formation of larval segments because, during embryogenesis, half of the larval segments are replaced by the remain half segment, but in a reversed polarity, which suggested that gooseberry was a single gene. [8]
The nervous system segmentation confers several developmental advantages to the vertebrate body as humans possess a body plan that is bilaterally segmented at the nervous system level. The segmentation is involved at all levels of the human nervous system with increasing level of complexity in the innervation from the brain to limbs. [1]
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Upon resolution of the type 2 junction, a new type 3 junction forms perpendicular to the original type 1 configuration. During this process the two dorsal-ventral cells have become neighbors. [ 5 ] When multiple clusters of cells intercalate in the dorsal-ventral axis, through junctional neighbor exchange, the outcome is an extension of germ ...
NFL Commissioner Roger Goodell on Wednesday said the league is aware of a lawsuit that accuses musician Jay-Z of rape but said it is not impacting the NFL's partnership with the rap mogul's Roc ...