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Below are 10 random bionumbers. Click a row for more details
ID Property Organism Value Units Range Details
102727 Diameter of a vesicle Various nm 40-80
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102373 Number of CD4plus cells in healthy adult Human Homo sapiens ~2e+11 cells per body
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100960 Kcat of Glucokinase Amoeba Dictyostelium discoideum 25.5 1/min
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101648 Mean size of first introns in a gene Human Homo sapiens 14186 bp
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102767 Number of Rab3As in typical synaptic vesicle Rat Rattus norvegicus 10 copies/vesicle
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100548 Number of prokaryotes in the top 200m of ocean prokaryote 3.6E+28 cells
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101522 Genome size Chlamydomonas reinhardtii 136 Mb
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102770 Number of VGLUT1 in typical synaptic vesicle Rat Rattus norvegicus 9 copies/vesicle
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101970 percent of protein encoding gene Human Homo sapiens 5 Percent
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100508 Diameter of monocytes Human Homo sapiens 15 um 12-18
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BioNumbers - the numbers you need, with references, in under a minute.

In August 2008, twenty highly motivated Harvard graduate students and post-docs were given the QBioChallenge - a set of six basic questions in quantitative biology.

For example: How many mRNAs are in a yeast cell? (a)~10,000 (b)~100,000 (c)~1,000,000 or (d)~10,000,000

After an hour of searching the internet and Harvard's collection of electronic journals, they got fewer than half of the questions right. Following this frustrating effort they were given a tip: use bioNumbers (www.bioNumbers.org). Using bioNumbers they found the answers to most questions and had full references within 10 minutes. In a few more minutes they became registered users and added entries to the bioNumbers database themselves.

Please tell us what would make bioNumbers more useful to you!