The process of removing intron sequences from the pre-messenger RNA, and then joining together exons.
Verb
To unite, as two ropes, or parts of a rope, by a particular manner of interweaving the strands, -- the union being between two ends, or between an end and the body of a rope.
To unite, as spars, timbers, rails, etc., by lapping the two ends together, or by applying a piece which laps upon the two ends, and then binding, or in any way making fast.
Circa 1525, borrowed from Middle Dutch splissen (Modern Dutch splitsen); akin to Middle Dutch splitten, German spleißen, Spliss, French épisser . The Dutch word originally referred only to the fraying of the ropes' ends, but was then also used for the entire process of fraying and retying; hence the peculiar semantic development from “split” to “join”.
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