A 27-year-old man presents to the emergency department with complaints of chest pain and hemoptysis. He reports a history of chronic sinusitis and recurrent pneumonias requiring multiple hospitalizations. He also mentions infertility in his family history, noting that he and his wife have been unable to conceive. During the physical examination, you notice heart sounds on the right side of the chest, and he confirms that he has situs inversus. Pulmonary function tests (PFTs) reveal a decreased FEV1/FVC ratio, consistent with obstructive lung disease. A CT scan of the chest shows dilated bronchioles with a signet-ring appearance and situs inversus. Which of the following embryonic processes is most likely defective in this patient?
