| Qualifier | organism |
| Definition | scientific name or higher-level classification of the organism or agent that provided the sequenced genetic material. |
| Value Format | "text" |
| Example | /organism="Homo sapiens" /organism="Lactobacillaceae bacterium" /organism="West Nile virus" /organism="synthetic construct" /organism="uncultured bacterium" |
| Comment | includes names for Prokaryotes, Eukaryotes, Viruses, synthetic sequences, uncultured samples, and unclassified organisms. The organism name which appears on the OS or ORGANISM line will match the value of the /organism qualifier of the source key in the simplest case of a one-source sequence. |