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==Key Stage 43==
===Meaning===
An '''amino acid''' is a building block of a [[protein]].
===Key Stage 4==
===Meaning===
An '''amino acid''' is a type of [[molecule]] which can combine with others to form [[protein]]s.
===About Amino Acids===
: '''Amino acids''' are used in [[Protein Synthesis|protein synthesis]] which takes place at the [[ribosome]]s inside [[Cell (Biology)|cells]].
: There are many different '''amino acids''' which join to form [[protein]]s.
: There are billions of different [[protein]]s that can be formed by different '''amino acids''' joining together.