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PubMed Entrez BLAST Genome Taxonomy Structure
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The NCBI Taxonomy Homepage

These are direct links to some of the organisms commonly used in molecular research projects:

Arabidopsis thaliana Escherichia coli Pneumocystis carinii
Bos taurus Hepatitis C virus Rattus norvegicus
Caenorhabditis elegans Homo sapiens Saccharomyces cerevisiae
Chlamydomonas reinhardtii Mus musculus Schizosaccharomyces pombe
Danio rerio (zebrafish) Mycoplasma pneumoniae Takifugu rubripes
Dictyostelium discoideum Oryza sativa Xenopus laevis
Drosophila melanogaster Plasmodium falciparum Zea mays

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