14139
These cDNA were 2343 bp long and their transcription initiation site was located 814 bp upstream from the J delta 1 segment .
 814 bp upstream, J delta 1 segment
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 814 bp upstream, J delta 1 segment