Which element is most chemically similar to the element indicated by the letter E in the following periodic table? 
Definitions:
Glycocalyx
A coating on the outside of an animal cell, formed by the polysaccharide portions of glycoproteins and glycolipids associated with the plasma membrane
Cell Wall
A rigid structure that surrounds the cell membrane in plants, fungi, and certain bacteria, providing structural support and protection.
Extracellular Matrix
A complex network of proteins, glycoproteins, and other molecules outside cells, providing structural and biochemical support to surrounding cells.
Smooth ER
A type of endoplasmic reticulum in cells, lacking ribosomes, involved in lipid synthesis, detoxification, and calcium ion storage.
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