This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Mi's expression of the following homeobox genes alters the position of the forelimbs during development 
Select and explain. 
A. HOX A7, B. HOX B8, C. HOX C9, D. HOX D 10
B: HOX B8
Answer: B: HOX B8 
Explanation: The carnival limit of expression of HOX B8 is at the carnival border of the forelimbs, and the mid - expression of this gene alters the position of these limbs Position of the limbs along the craniocaudal axis in the flank regions of the embryo is regulated by the HOX genes expressed along this axis. Ref: Gray's 39e/p-1289