Heart Chamber Specification Is Dependent on the Loss,gain,or Limited Expression

question 5

Multiple Choice

Heart chamber specification is dependent on the loss,gain,or limited expression of several transcription factors.What pattern of expression supports specification and formation of the right ventricle?

• A) Loss of expression of Tbx5 within the primary heart field
• B) Loss of expression of Irx4 within the cranial portion of the primary heart field
• C) Restricted expression of RALDH-2 to the cranial portion of primary heart field
• D) Continued expression of Isl1 and Tbx1 within the secondary heart field

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