Examlex
What component of amino acid structure varies among different amino acids?
Business Letter
A formal document used for communication between companies, or between a company and an individual, characterized by a structured layout and professional tone.
Transparent Window
A clear section of material that allows light to pass through, making objects or environments on the opposite side visible.
Envelopes
Paper or plastic enclosures used for sending letters, documents, or other items, sealed at one end with an opening at the other.
Watermark
A recognizable image or pattern in paper or digital form that appears as various shades of lightness/darkness, used to identify authenticity and prevent counterfeiting.
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