You've just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. What is the significance of this finding?

The regular occurrence of sulfur-containing cysteine residues suggests the presence of disulfide bonds, which play a crucial role in stabilizing the protein's structure. This finding may indicate that the protein is structurally stable and has important functional properties, such as resistance to denaturation or the ability to form specific disulfide-linked interactions.