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Genomes and chromosomes

chromosome: In IGB, chromosome refers to any single sequence. Typically this corresponds Chromosome, also called contig or reference sequence, refers to one or more annotated sequences that form a genome assembly. For completed genome projects, these often correspond to the sequence of a physical chromosome. Alternatively, it they may represent an assembled contig contigs corresponding to part parts of a physical chromsome. All chromosomes in IGB are assumed to be DNA, rather than RNA sequences. No two chromosomes within the same genome version can have the same name.genomechromosome.

Genome, genome version, or assembly: These terms refer to a group of chromosome sequences that you or another group assembled and made availableannotated sequences corresponding to the genome sequence of an organism. IGB designates these using the month and year they were published or made publicly available. For example, NCBI versions 35 and 36 of the human genome are considered to be two separate genome assemblies. Each one contains multiple chromosome sequences, including the expected chromosomes 1 to 22, X and Y. Other sequences, such as "chr22_random" are also considered distinct chromosomes for the purposes of display in IGB.Every sequence in IGB is identified by its genome version and chromosome names, which must therefore be distinct.

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Tracks

Tracks are rows of data that appear in the IGB interface. When you open a file, the data within the file will appear in one or more tracks. Older versions of IGB refered to tracks as "tiers" and so you may see this term used elsewhere in the User's guide.

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