How are the data released from DDBJ published at EMBL-Bank, GenBank?

DDBJ is functioning as one of the international nucleotide sequence databases, including EMBL-Bank/EBI in Europe and GenBank/NCBI in the USA as the two other members.
When DDBJ releases the submitted data, EMBL-Bank and GenBank will load the data into their own services, respectively.
See Sequence Data Transition.
Note that the data are converted into EMBL-Bank or GenBank format.