Our cDNA libraries feature full-length-enriched and high quality size-fractionated cDNA. cDNA library construction is usually done in slightly-modified versions of pBluescript or pcDNA3.1. Insert sizes will range from about 0.5Kb to 4Kb. Concerning QC steps, we evaluate the average insert size, empty clone rate and clone concentration/tube before shipping out. We always provide a gel picture of randomly selected clones showing the insert size of each.