The goal of this exploratory study is to assess the role of a novel aminopeptidase-like protein during the induction of airway inflammation in asthma. This aminopeptidase-like protein may be involved in processing of the type I TNF receptor to a soluble form. We propose to study the role of this aminopeptidase-like protein in the setting of late phase asthmatic airway inflammatory responses following segmental allergen challenge in mild allergic asthmatics.