Multiple choice

The variable region of a heavy chain immunoglobulin is encoded by three DNA segments, VH (variable), D (diversity) and JH (joining). What is the approximate number of D segment genes in the immunoglobulin heavy chain gene locus?

  1. 40

  2. 30

  3. 9

  4. 6

  5. 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

D regions are only found in the heavy chain; the light chain gene loci lack D segments.

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