In attempting to determine the original text of the New Testament books, some modern textual critics have identified sections as additions of material, centuries after the gospel was written. These are called interpolations. In modern translations of the Bible, the results of textual criticism have led to certain verses, words and phrases being left out or marked as not original. According to Bart D. Ehrman, "These scribal additions are often found in late medieval manuscripts of the New Testament, but not in the manuscripts of the earlier centuries."