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Chapter 4.8
Cell to Cell Interactions
8
Biology
Undergraduate 1
10/09/2010

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Term
Glycolipids
Definition
Lipids with carbohydrate heads. Responsible for various things such as A, B, and O blood type markers.
Term
MHC Proteins
Definition
Work to protect cells by labeling them as "self" and "nonself" cells so the immune system comprehends.
Term
Cell Junctions
Definition
Long lasting or permanent connections between cells.
Term
Tight Junctions
Definition
Connects the plasma membranes of adjacent cells in a sheet. Acts as a wall within the organ, keeping molecules on one side or the other. Holds cells together such that materials pass through but not between the cells. 
Term
Anchoring Junctions- Desmosome
Definition
Intermediate filaments of cytoskeleton linked to adjoining cells through cadherins. They act as anchoring junctions binding cells together.
Term
Anchoring Junctions- Adherens Junction
Definition
Transmembrane fibrous proteins. Act as anchoring junction that connects extracellular matrix to cytoskeleton.
Term
Communicating Junction (Gap Junction) 
Definition
Six transmembrane connexon proteins creating a pore that connects cells. It allows the passage of small molecules from cell to cell in a tissue. Occurs in cardiac muscle.
Term
Communicating Junction (Plasmodesmata)
Definition
Cytoplasmic connections between gaps in adjoining plant cell walls. Communicating junction between plant cells. Allow small molecules and ions to pass between cells.
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