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• UMI (Unique Molecular Identifier): random 10 bp nucleotide sequence that distinguishes which reads came from the same transcript. 
• Barcode: the unique identifier in each droplet which usually contains reads from a single cell. 
• Contig: assembled reads containing the same UMI and barcode that align to the same transcript sequence sequence of bases from the assembly⁶. 
• Complementarity-Determining Region: CDR1, CDR2, and CDR3 are important in antigen binding of a T or B cell receptor. 
• CDR3 (Complementarity-Determining Region 3): CDR3 spans the V(D)J junction. There is one CDR3 nucleotide sequence for each V(D)J contig.
• Clonotype: cells derived from a common ancestor during clonopoiesis which have a particular composition. The cells in a clonotype can have a different number of chains or different CDR3 regions but still be considered a single clone (CDR3 is a highly variable region used for binding; an example of different CDR3 regions would be from affinity maturation which can occur in memory B cells).

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