MBL2 and asthma: Leung et al. observed that polymorphisms in the Mannose-binding lectin (MBL) gene may protect against cockroach sensitization in Chinese children [68], and Pistiner et al. demonstrated that polymorphisms in IL12A were associated with cockroach sensitization among children with asthma in both Costa Rica and European-ancestry children with asthma in the Childhood Asthma Management Program (CAMP) [69].