Illustration of MSCG. (A) An example of MSCG from two samples. For simplicity, the vertices s and t as well as the corresponding edges connecting s or t are not shown. (B) An example of two samples with coexpressed segments and exclusively expressed segments (see Section). Segments 3 and 5 (marked in read) are exclusively expressed in two isoforms of sample 1, but are coexpressed in two isoforms of sample 2. Both samples generate the same MSCG.