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B1 is an open archive file format that supports data compression and archiving [citation needed]. B1 files use the file extension ".b1" or ".B1" and the MIME media type application/x-b1. B1 incorporates the LZMA compression algorithm. [1] B1 archive combines a number of files and folders into one or more volumes, optionally adding compression ...
Cell Biology in "The Biology Project" of University of Arizona. Centre of the Cell online; The Image & Video Library of The American Society for Cell Biology Archived 2011-06-10 at the Wayback Machine, a collection of peer-reviewed still images, video clips and digital books that illustrate the structure, function and biology of the cell.
B1 cells generate diversity mainly via recombinatorial recombination (there is a preferential recombination between D-proximal VH gene segments). [citation needed] B1 cells characteristically express high levels of surface IgM (sIgM), demonstrable CD11b, and low levels of surface IgD (sIgD), CD21, CD23, and the B cell isoform of CD45R (B220). [7]
Fixation rates can easily be modeled as well to see how long it takes for a gene to become fixed with varying population sizes and generations. For example, The Biology Project Genetic Drift Simulation allows to model genetic drift and see how quickly the gene for worm color goes to fixation in terms of generations for different population sizes.