Lymph nodes often swell in one location when a problem such as an injury, infection, or tumor develops in or near the lymph node. Which lymph nodes are swollen can help identify the problem. 1  The glands on either side of the neck, under the jaw, or behind the ears commonly swell when you have a cold or sore throat.ymph nodes often swell in one location when a problem such as an injury, infection, or tumor develops in or near the lymph node. Which lymph nodes are swollen can help identify the problem. 1  The glands on either side of the neck, under the jaw, or behind the ears commonly swell when you have a cold or sore throat.
keratinocyte. [keratâ²inÅsÄ«tâ²]. Etymology: Gk, keras + kytos, cell. an epidermal cell that synthesizes keratin and other proteins and sterols. These cells constitute 95% of the epidermis, being formed from undifferentiated, or basal, cells at the dermal-epidermal junction.tymology: Gk, keras + kytos, cell. an epidermal cell that synthesizes keratin and other proteins and sterols. These cells constitute 95% of the epidermis, being formed from undifferentiated, or basal, cells at the dermal-epidermal junction.
Keratin is an extremely strong protein that is a major component in skin, hair, nails, hooves, horns, and teeth. The amino acids which combine to form it have several unique properties and, depending on the levels of the various amino acids, it can be inflexible and hard, like hooves, or soft, as is the case with skin.eratin is formed by keratinocytes, living cells that make up a large part of skin, hair, nails, and other parts of the body. The cells slowly push their way upwards, eventually dying and forming a protective layer.