Figure 1 The extracellular matrix (ECM). While cells can be surrounded by an extracellular matrix, other cells form a single layer of cells that sit on top of the extracellular matrix. In this case the extracellular matrix can contain a special structure called the basement membrane. Collagen is a major component of the ECM but the matrix contains many different components.
Endoplasmic reticulum
Extracellular matrix
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