When Origen Escaped the Persecutions in Alexandria the Text of the Gospel of Mark he Started Citing From Then On Was Different From Before

"An example of how the move from one city to another could affect the character of a Father's citations is illustrated in the change that took place in Origen's text of Mark after he moved to Caesarea — a change that appears to be due to the differences between the manuscripts available to him in Alexandria and those in Caesarea." [the Text of the Gospels in Clement of Alexandria Carl P. Cosaert p. 15]