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But this is from the bug’s tarsal claws, not its mouth, Dr. Urban said.

He had “marked flexure of the carpal and tarsal joints of all four limbs”—that is, hooked legs.

The high schoolers and intermediate schoolers also compared notes about collar bones, fibulas, tibias, clavicles, tarsals and other bones found in the human body.

Shin said the spy agency identified Kim’s condition as tarsal tunnel syndrome, an often painful condition that is caused by the compression of a nerve, sometimes because of a cyst.

The growth which materialised in May was caused by what is known as "tarsal tunnel syndrome" whereby a nerve is pinched, causing the ankle to swell.