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Welcome to Prochlorococcus Portal

One of the goals of the Chisholm Lab is to develop Prochlorococcus, and its phage, as a model system for Integrative Systems Biology. Advances in sequencing and high-throughput technologies have begun to generate massive databases of microbial genes and transcriptomes in the oceans, and we are fortunate that Prochlorococcus genes are well represented in these data bases.
In addition, genomes of cultured isolates of Prochlorococcus, and the phage that infect them, are growing in number, as are microarray experiments to examine gene expression. The goal of this public website is to provide easy access to this growing database of Prochlorococcus.


Release Notes

Jan 2016: Attention! This site is no longer being actively developed. We are very excited to announce the development of IMG/ProPortal, a new and improved resource that will combine the aims of the legacy ProPortal system with the bioinformatic power of IMG (to find out more about IMG, click here ).

If you think IMG/ProPortal could be useful to you in the future, please help us by filling out a user survey here. You can also use this survey to sign up for future beta releases and to receive development news. Your responses are integral to making IMG/ProPortal the go-to resource for Prochlorococcus biology and ecology!

Sep 2014: Genome data and cluster definitions have been updated to reflect newly released Prochlorococcus genome sequences. For more detail see:

Biller, S. J. et al. Genomes of diverse isolates of the marine cyanobacterium Prochlorococcus. Sci. Data 1:140034 doi: 10.1038/sdata.2014.34 (2014)
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