The data also showed that the ACE2 peptides detected in the serum exosomes of COVID‐19 patients matched the ACE2 protein sequences spanning from the N terminus to the C terminus of the ACE2 protein including the ectodomain (residues 1–740), the transmembrane domain (residues 741–762), and the cytoplasmic tail (residues 762–805; Fig EV1). Here, ACE2 is linked to COVID-19.