<p>A number of plant and fungal proteins that bind N-acetylglucosamine (e.g. solanaceous lectins of tomato and potato, plant endochitinases, the wound-induced proteins: hevein, win1 and win2, and the <taxon tax_id="28985">Kluyveromyces lactis</taxon> killer toxin alpha subunit) contain this domain [<cite idref="PUB00003415"/>]. The domain may occur in one or more copies and is thought to be involved in recognition or binding of chitin subunits [<cite idref="PUB00001396"/>, <cite idref="PUB00002707"/>]. In chitinases, as well as in the potato wound-induced proteins, the 43-residue domain directly follows the signal sequence and is therefore at the N terminus of the mature protein; in the killer toxin alpha subunit it is located in the central section of the protein. </p>