Once the secretor (Se) genes is missing is the Lea antigen present upon that red blood cell membrane.
Epithelial cells, which are closely bonded to one another, nerve impulses, which are specialized in communication, muscle cells, which are specialized in contraction, and connective tissue cells are the four primary cell types.
Upon the earth, there really are living cells wherever unless it is sterile. If you run your hands along a smooth metal gate, you will likely find pollen, bacterial, fungal, and green algal cells (even wood is made up of dead plant cells).
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