Constriction ring The equatorial ring of microfilaments

that diminishes in diameter, probably both by contraction and disassembly, as cytokinesis proceeds.

contact following Behaviour shown by individual slime mould cells when they join a stream moving towards the aggregating centre. Contact sites A at front and rear of cell may be involved in Dictyostelium.

contact guidance Directed locomotory response of cells to an anisotropy of the environment, for example the tendency of fibroblasts to align along ridges or parallel to the alignment of collagen fibres in a stretched gel.

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