Upper limit
If the sequence is really observed, there is no upper limitation of the sequence length to submit to DDBJ.
However, we can not accept any operationally joined sequence, for example, joining chromosomes. We accept each chromosome sequence, respectively.
For sequences greater than 500 kbases in its length, please submit by using Mass Submission System (MSS) instead of Nucleotide Sequence Submission System (NSSS).
Lower limit
Since June 2021, when the sequence is less than 100 bp in its length, we will refuse the sequence data submission.
References
Is there any case to reject submission to DDBJ?
Acceptable data for DDBJ