DNA sequence length in numbers of base pairs.
1 kbp (kilo base pairs) = 1,000 bp (base pairs)
1 Mbp (mega base pairs) = 1,000,000 bp
1 Gbp (giga base pairs) = 1,000,000,000 bp
1 Tbp (tera base pairs) = 1,000,000,000,000 bp
Alternative abbreviations such as kb, Mb, and Gb (gigabases) are sometimes used, but kbp, Mbp, and Gbp (giga base pairs) are often preferred to avoid confusion with gigabytes (GB) of computer storage.