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ChloroP 1.1 Server

The ChloroP server predicts the presence of chloroplast transit peptides (cTP) in protein sequences and the location of potential cTP cleavage sites.

A related service TargetP predicts the subcellular location of proteins by integrating predictions of chloroplast transit peptides, signal peptides and mitochondrial targeting peptides.

Instructions Output format Data sets Abstract Recent changes


Paste a single sequence or several sequences in FASTA format into the field below:

Submit a file in FASTA format directly from your local disk:

Detailed output


At most 50 sequences and 200,000 amino acids per submission; each sequence not more than 4,000 amino acids.


The sequences are kept confidential and will be deleted after processing.


For publication of results, please cite:

ChloroP, a neural network-based method for predicting chloroplast transit peptides and their cleavage sites
Emanuelsson O, Nielsen H, von Heijne G
Protein Sci. 8(5):978-84, 1999

View the abstract. For the errors in the published version of the article click here .


Would you prefer to run ChloroP at your own site? ChloroP 1.1 is available as a stand-alone software package, with the same functionality as the service above. Ready-to-ship packages exist for the most common UNIX platforms. There is a download page for academic users; other users are requested to contact CBS Software Package Manager at


Scientific problems:        Technical problems: