Lysozyme is a ~14 kDa protein present in many mucosal secretions （tears, saliva, and mucus） and tissues of animals and plants, and plays an important role in the innate immunity, providing protection against bacteria, viruses, and fungi. Three main different types of lysozymes are known: the c-type （chicken or conventional type）, the g-type （goose type）, and the i-type （invertebrate type） [PMID: 34943746].