To compare the abundances of individual KOs and their pathways among different samples, such abundances in each metagenomic sample were normalized by the number of genomes that were estimated as the average abundance of gyrB and 35 universal single-copy genes (USCGs), each of which is carried as a single-copy form by almost all prokaryotic genomes (Supplementary Table S4).
Whereas the Drosophila secretory pathway consist of tER sites closely associated to individual Golgi stacks, its mammalian homolog structure is made of Golgi stacks linked to form a single copy organelle forming a ribbon (Rabouille et al., 1999; Ripoche et al., 1994).
According to De Smeth et al., "it can be argued that single copy genes form a well-conserved core that is sensitive to either mutation or duplication".
The two euchromatic BACs [Figure 1A and 1B] have a similar appearance – low or single copy regions form most of the sequence, and they are interspersed by sequences that are found in tens, hundreds or thousands of copies, such as stretches of satellite repeats or transposable elements.
Eight 'high copy' isolates (with copies varying from 7 to 17) along with two single copy isolates formed Cluster 3.
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Following excision, both GEI ends close up to form a single copy of the recombination site (attP) (Ravatn et al., 1998b; Doublet et al., 2005; Qiu et al., 2006; Ramsay et al., 2006).
The C2221 crystal form contains a single copy of a trimer in each asymmetric unit.
In contrast, genes encoding small nucleolar RNAs (snoRNAs) are either single-copy or form small families.
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