protein S

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A vitamin K-dependent antithrombotic protein that functions as a cofactor with activated protein C.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
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Cultural definitions for protein S

[ (proh-teenz, proh-tee-inz) ]

Complex organic molecules (see also organic molecule) made up of amino acids. Proteins are basic components of all living cells and are therefore among the principal substances that make up the body. In addition to being necessary for the growth and repair of the body's tissues, proteins provide energy and act as enzymes that control chemical reactions in the cell.

notes for proteins

Foods that contain a high percentage of protein include meat, fish, poultry, milk products, beans, and nuts.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.