Single cell protein refers to:
Sources of mixed proteins extracted from pure or mixed culture of organisms or cells
Single cell proteins are the dried cells of microorganisms which are used as protein supplements in human or animal feeds. It refers to edible unicellular microorganisms. The biomass or protein extract from pure or mixed cultures of algae, yeasts, fungi or bacteria may be used as an ingredient or a substitute for protein-rich foods and is suitable for human consumption or as animal feeds.