Is There a Terminological Distinction Between “Protein” and “Proteins”?
The terms protein and proteins are frequently used interchangeably, both denoting macromolecular compounds composed of amino acids. These molecules perform a wide range of biological functions within cells, such as catalyzing biochemical reactions (as enzymes), acting as signaling molecules, providing structural support, and participating in immune responses.
Protein
This term typically refers to a specific and well-characterized protein molecule or type. Examples include hemoglobin and antibodies.
Proteins
This term is generally used in a broader context to describe either a class of protein compounds or the complete set of proteins expressed in a given tissue, cell, or organism. For example, proteomics is the scientific discipline concerned with the comprehensive analysis of protein composition, structure, and function.
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