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Disclaimer: Numbers in biology depend highly on conditions.
Use values as order of magnitude estimates or refer to experimental details in cited literature.

Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
101414 Concentration of dATP in a 42fL yeast cell, measured from an asyncrhonous population Budding yeast Saccharomyces cerevisiae 44 uM
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103585 Fraction of daily output of B cells produced in bone marrow daily out of total B lymphocyte population vertebrates Percent 5-10
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101476 Number of alveoli in lung Human Homo sapiens unitless 274000000-790000000
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100737 Maximal production rate of LacZ Bacteria Escherichia coli 100 Molecules/minute approx.
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104469 Genome size - largest bacterial genome as of 2008 Bacteria Sorangium cellulosum 1.3e+7 bp
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101720 Kinetic parameters of soluble cytochrome b5 reductase from human erythrocytes Human Homo sapiens N/A Table Link - http://tinyurl.com/6jcog5
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101034 Kcat of Pyruvate kinase in liver Rat Rattus norvegicus 1/min 108,000 - 114,400
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101873 KD’s for Hb complexes of various phosphorylated compounds Generic N/A Table Link - http://tinyurl.com/5pyd6o
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102452 Percent out of all isolated strains that are methicillin resistant Bacteria Staphylococcus aureus >=60 Percent
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104870 Total translation time of the lacZ gene (1025 codons) Bacteria Escherichia coli 82 sec +-0.6
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Did you ever need to look up a number like the volume of a cell or the cellular concentration of ATP, only to find yourself spending much more time than you wanted on the Internet or flipping through textbooks—all without much success?

Well, it didn’t happen only to you. It is often surprising how difficult it can be to find concrete biological numbers, even for properties that have been measured numerous times. To help solve this for one and all, BioNumbers (the database of key numbers in molecular biology) was created. Along with the numbers, you'll find the relevant references to the original literature, useful comments, and related numbers.

Use textbox on the left to tell us numbers you are searching for and couldn’t find or any comments.
Invitation to help BioNumbers with the most wanted numbers:
Log in as a user and make entries of the values below, references are much appreciated.
1) Number of HLA (Human Leukocyte Antigen, MHC) molecules on an average human cell.
2) Mass of total protein in human cell.