The highly bred corn plant of today (Zea mays) bears little resemblance the wild grass, Teosinte, from which it was derived thousands of years ago. In addition to being a food source, corn is used for fodder and industrial processes. For geneticists, corn has been a model organism for decades and a wealth of induced mutations has been extremely useful in elucidating a number of biological and developmental processes.

Corn was added to the ChromDB database initially as transcript-based sequences derived from EST contigs. Currently the corn genome is being sequenced by a number of laboratories (e.g. Washington University). The ChromDB staff is converting corn sequences from transcript-based to genomic-based as the genomic sequences are made available.