The express messenger appeared in the doorway, accompanied by a young man in a long Ulster and traveling cap.

These days, the average office worker receives more than 200 messages a day via snail mail, e-mail, express mail, cell phone, landline, wireless Web, bicycle messenger, singing telegram, you name it.

This suggest that Ca ions play an important role as the second messenger to induce the express of cold resistance genes to adapt the low temperature.