| reactant | A substance taking part in a chemical reaction. Acute phase reactants, A group of proteins that are produced and/or released in increased concentrations during the acute phase reaction, including fibrinogen; C-reactive protein; complement proteins B, C3, C4; a2-acid glycoprotein, serum amyloid A, proteinase inhibitors, etc. (05 Mar 2000) |
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| leading edge | The initial part of a wave form at maximum slope. (05 Mar 2000) |
| leading lamella | <cell biology> Anterior region of a crawling cell, such as a fibroblast, from which most cytoplasmic granules are excluded. (18 Nov 1997) |
| leading strand | The DNA strand that is synthesised continuously during replication Compare: lagging strand. (09 Oct 1997) |