(immunology) Any of a group of plasma proteins that bring about the destruction of pathogens through opsonization or assault on the cell membrane.

(biochemistry) Any protein that is permanently attached to a biological membrane and protrudes on each side

(biochemistry) Any structural protein

Any source of protein that contains an adequate proportion of all of the essential amino acids necessary to the diet.

(biochemistry) The process that moves proteins to appropriate locations in a cell

plural of protein subunit

(biology) A part of protein sequence and structure that can evolve, function, and exist independently of the rest of the protein chain.

plural of protein domain

(biochemistry) A protein formed by genetically fusing or combining a gene encoding a target protein of interest with a gene encoding a protein or portion of protein that adds a desired functionality to the target.

(biochemistry) An iron-sulfur protein component of cytochrome complexes.