KEGG: biological systems database as a model of the real world.

KEGG (https://www.kegg.jp/) is a database resource for representation and analysis of biological systems.

KEGG tools for classification and analysis of viral proteins.

The KEGG database and analysis tools (https://www.kegg.jp) have been developed mostly for understanding genes and genomes of cellular organisms.

KEGG for taxonomy-based analysis of pathways and genomes.

KEGG (https://www.kegg.jp) is a manually curated database resource integrating various biological objects categorized into systems, genomic, chemical and health information.

KEGG mapping tools for uncovering hidden features in biological data.

In contrast to artificial intelligence and machine learning approaches, KEGG (https://www.kegg.jp) has relied on human intelligence to develop "models" of biological systems, especially in the form of KEGG pathway maps that are manually created by capturing knowledge from published literature.