A “source modifier” provides more specific information about the source material used to obtain the sequence than the feature “source” can convey by itself. Modifiers take the form of a slash (/) followed by the modifier name and, if applicable, an equal sign (=) and a value. Source modifiers can take the form of text, feature labels, sequences, controlled vocabulary (predefined, authorized terms that have been preselected by a particular institution), or citation/reference numbers (source identifiers). For a list of modifier types and their definitions, You will find a comprehensive list of modifiers in DDBJ/EMBL/GenBank Feature Table definition document.
The purpose of the dnadb submission portal “Source Modifiers” page is determine the required source modifiers you need to submit. The required source modifiers depend on the method you used to obtain the sequence from the bacteria or archaea.The “Source Information” section of the “Source Modifiers” page showing the drop-down list that appears when you click in the “Organelles/Locations” text box.
