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(Currently studying high-school Biochemistry)

I'm unable to distinguish between phospholipids and phosphoglycerides from their "definitions" (Courtesy: Wikipedia)

On phospholipids:

enter image description here

Which suggests that phospholipids necessarily contain a glycerol "bridge" that connects the fatty acid tail to the phosphate head. To me, this looks like,

enter image description here

On phosphoglycerides:

enter image description here

"Glycerol-based phospholipids"?! But aren't phospholipids already 'glycerol-based'?

If both phospholipids are glycerol-based, and if phosphoproteins are "glycerol-based phospholipids"...how are they any different?

What am I missing here?

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Phospholipids of a lipid bilayer can be divided in to two groups:

  1. Those derived from glycerol - phosphoglycerides.
  2. Those derived from sphingosine - sphingomyelin.

Phosphoglycerides are indeed a type of phospholipid.

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