The Nullomers Database is a web-based resource which aims to facilitate exploration of biological nullomers (a.k.a. minimal absent words). Its purpose is to catalogue and enable sharing statistically significant non-occurring sequences which are unexpectedly absent in several genomes and proteomes. Read more about the evaluation method or follow the step-by-step user quide.


Genomic nullomers

Explore statistically significant absent sequences from various species

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Peptide nullomers

Find out significant missing peptides in human and mouse proteomes

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Nullomers in viruses

Browse statistically significant non-occuring motifs in viruses

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