With more than 125 million people infected and nearly 3 million dead, the COVID-19 pandemic has disrupted the world in inconceivable ways. Adding to the challenge is that the patient condition varies widely, from the asymptomatic to respiratory failure and death. A new study by CiRA researchers shows how iPS cells can be used to study infection by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), revealing gender differences seen with the disease.