I used to write a small C program to identify the distribution of certain oligonucleotide pattern among given sequences, which are usually genomic DNAs and could be as large as 300Mb like human chromosome 1. I recently realized that a handy tool to calculate some sequence properties, such as the GC ratio, CpG density or restriction site distribution, is very helpful to others too. Hence I wrote a Perl CGI wrapper for that program so that everyone can use it on the web. This is still a primitive version, which doesn't allow the match of multiple patterns. The output format requires further improvements too. The reason I like it is that it can handle very large sequence efficiently, and the report is in html format, which can be easily opened by Microsoft Excel throught which a variety of chart could be drawn.

Query sequence: (FASTA format only, multiple sequences are accepted.)