Subset Code Subset Name Concept Code NCIt Preferred Term Source PT Source Synonyms(s) Source Definition Semantic Type C168697 CBDD Structure Terminology C157466 Monomer Connection Points Branched structural repeat unit connection points The atoms that make up the head and branch points within a single repeating monomeric unit in a branched polymer. Chemical Viewed Structurally C168697 CBDD Structure Terminology C164241 Cross-Linked Chemical Connection Points Cross-linked structural repeat unit connection points The atoms that make up the head and the tail points within a structural repeat unit that are involved in cross-links in a polymer. Chemical Viewed Structurally C168697 CBDD Structure Terminology C184959 Polymerization Degree Calculation Notation Degree of polymerization notation The formula(s) used to calculate the quantity or average number of structural repeat units in a polymer. Qualitative Concept C168697 CBDD Structure Terminology C165845 Monomer Deletion Site Monomer deletion site The location of a monomer deletion in a polymer. Chemical Viewed Structurally C168697 CBDD Structure Terminology C157467 Nucleotide Connection Points Nucleotide connection points The phosphorus (P) atom found in the phosphate group and the oxygen (O) atom bound to the 3' carbon of the sugar within a single nucleotide, which can each form linkages with adjacent nucleotides during nucleic acid synthesis. Chemical Viewed Structurally C168697 CBDD Structure Terminology C157224 Nucleotide Substitution Site Nucleotide substitution site Nucleotide substitution point The nucleotide position that is substituted in a nucleic acid variant. Cell or Molecular Dysfunction C168697 CBDD Structure Terminology C164242 Nucleotide Polymer Polynucleotide A biopolymer composed of nucleotide monomers. Chemical Viewed Structurally C168697 CBDD Structure Terminology C177524 R-group R-group A variable functional chemical moiety that is attached to a larger molecule. Conceptual Entity C168697 CBDD Structure Terminology C177645 R-group Connection Point R-group Connection Points The pseudoatom(s) (usually denoted as *) that are involved in binding a functional group (R-group) to a larger molecule. Chemical Viewed Structurally C168697 CBDD Structure Terminology C164243 Structural Repeat Unit Structural repeat unit A chemical fragment that represents a single repeating structure in a polymer. Conceptual Entity