1.   And one leading expert said the mouse experiments did not address the critical question of how the medicine might work in someone already exhibiting the characteristic smallpox lesions.

2.   Smallpox lesions tend to feel as if they are deep in the skin, in contrast to the lesions of chickenpox, which feel superficial.

3.   The stockpile includes dried scabs that fall from smallpox lesions.

4.   They said in interviews that they would show course participants pictures of smallpox lesions at various stages of development.