Term Name:	five_prime_D_spacer
Synonyms:	5'-SPACER, five prime D spacer, five prime D-spacer
Definition:	12 or 23 nucleotide spacer between the 5' D-heptamer (SO:0000496) and 5' D-nonamer (SO:0000497) of a 5' D-recombination signal sequence (SO:0000556) of an immunoglobulin/T-cell receptor gene.
Ontology:	Sequence Ontology [SO:0000498]