Stratified Squamous Epithelium
The skin, which protects the body, is made of squamous epithelium. Skin epithelial cells are arranged in many layers to prevent wear and tear. Since they are arranged in a pattern of layers, the epithelium is called stratified squamous epithelium.
Http://www.brooklyn.cuny.edu/bc/ahp/LAD/C3/C3_elecEnergy.html
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<span>Do not specify a particular amino acid and provide punctuation or instructions such as "stop."
</span>
Or in other words
Do not specify a particular amino acid and are signals to terminate translation.
Ferns are both seedless and vascular