The same collection of pig probes (ESTs) used in earlier studies [34, 35] were spotted in triplicate on Corning Ul-traGAPS slides. Briefly, this collection consisted of 2,928 probes prepared from jejunal mucosal scrapings collected from 4-week-(672) and 12-week-(2,256) old pigs, probes coding for porcine cytokines (IFN-c, TNF-a, GMCSF, IL-2, 4, 6, 8, and 10) and lung surfactant proteins SFTPA and SFTPD, and 110 Marc1 and Marc2 probes (porcine ESTs) homolog to trefoils, collectins, defensins, and glycosyltransferases [34] . A list of the probes already sequenced/ annotated is accessible on the website of Arch Virol (gene list Hulst et al. pdf).