part_of J_gene_recombination_feature J_heptamer J-HEPTAMER 7 nucleotide recombination site (e.g. CACAGTG), part of a J-gene recombination feature of an immunoglobulin/T-cell receptor gene. SO:0000515 J heptamer sequence heptamer_of_recombination_feature_of_vertebrate_immune_system_gene