Computation of
Chaos Game Representation of frequencies (FCGR)

Sequence name
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Search oligos of length
Sequence code (max: 5,000,000 bp; all digits, spaces and other non-coding characters will be removed)

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This tool will compute a Chaos Game Representation of Frequencies image (FCGR) as described by Deschavanne at al. (1999) to represent frequencies of oligonucleotides. Almeida et al. (2001)  proposed the name FCGR (frequency matrices extracted from CGR) to name this modification of Chaos Game Representation.

An open source PHP program to generate FGCR images is available here


Deschavanne,P.J., Giron,A., Vilain,J., Fagot,G. and Fertil,B. (1999) Genomic signature: characterization and classification of species assessed by chaos game representation of sequences. Mol. Biol. Evol. 16:1391-9. PubMed.

Almeida,J.S., Carriço,J.A., Maretzek,A., Noble,P.A. and Fletcher,M. (2001) Analysis of genomic sequences by Chaos Game Representation. Bioinformatics 17: 429 - 437. PubMed.