SOX9 is necessary for testis development. Which of the following factors are necessary for activation of its expression embryonically?

During embryonic development the vessels of the vasculature must correctly connect. Which of the following molecules mediate this event?  

Cardiac neural crest cells contribute to septa that separate the trunk arterioles into the pulmonary artery and aorta, such that lack of these neural crest cells can lead to __________. Complete the sentence with the best answer below.

All heart cells derive from a common progenitor referred to as the ___________. Fill in the blank with the best answer.

The green structure in the image represents a developing pharyngeal arch. Considering its location and the adult structures that arise from it, which pharyngeal arch is shown below in green?

If Vascular Endothelial Growth factor (VEGF) is knocked out in mouse embryos which of the following is most likely responsible for the phenotype?  

Which factor induces myoblast specific genes that pushes cells irreversibly into the myoblast lineage?

Osteopetrosis is associated with an increase in _________________ due to a failure of the ________________.

During an EKG, what does the P-wave represent?      

Name the precordial lead labeled E in the image.