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countable and uncountable, plural proteins
(biochemistry, countable) Any of numerous large, complex naturally-produced molecules composed of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds. quotations examples
Proteins carry out the bulk of cellular functions, including relaying signals, providing structural support, and accelerating biochemical reactions.
2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 534
(nutrition, uncountable) One of three major classes of food or source of food energy (4 kcal/gram) abundant in animal-derived foods (i.e. meat) and some vegetables, such as legumes. examples
(nutrition, countable) A food rich in protein, often a meat or meat substitute. quotations examples
The preparation style should be the same for both proteins so that the side dishes compliment the meal.
2015 April 29, Mandy Unanski Enright, “One Meal, Two Proteins”, in Nutrition Nuptials, archived from the original on 11 April 2019
Served with seasoned rice, classic Greek salad, pita, tzatziki, choice of 2 proteins & 2 sides
2017, Daphne's California Greek, Catering Menu
What should you get for lunch at a halal cart? Nutritionists explain how to pick a protein that isn't packed with calories and why you should beware the white sauce
2018 May 31, Mary Kekatos, Daily Mail