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Imagine a family pedigree.

Mathematically it is a graph, which consists of nodes and edges. Nodes being family members, and edges - their relationships.

In a clinical setting, what is the proper term for the nodes? Would they be called 'leafs'?

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So in a pedigree, Standardized Human Pedigree Nomenclature: Update and Assessment of the Recommendations of the National Society of Genetic Counselors notes that these "nodes" in the pedigree are the "individual symbol" denoting individuals. Although, when you read it, you'd read "Male," "Female," "Gender Unspecified," etc. instead of individual symbol.

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