Examlex
Stem cells are not common to all multicellular organisms.
Hydrophilic Head
The part of a molecule, particularly in lipids, that is attracted to water.
Phospholipids
Phospholipids are a class of lipids forming the major component of all cell membranes, characterized by a hydrophilic head and two hydrophobic tails, providing vital barrier and structural functions.
Permeable
A characteristic of materials that allows liquids or gases to pass through them due to the presence of tiny holes or pores.
Proteoglycans
Large molecules composed of proteins and glycosaminoglycans that provide structural support in cellular matrices.
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