Fig. 8
From: Measuring, visualizing, and diagnosing reference bias with biastools
Two examples of repetitive context. a The repetitive is extending to the right side, so the effective variant is extending to the right end so that the ALT context sequence is no longer a prefix of REF context sequence. b The case original ALT context sequence is a substring of REF context sequence. There are two choices of effective variant. Biastools would chose the shorter effective variant (choice 2)