Alternative splicing status of orthologous gene pairs of Volvox and its closely related, unicellular relative Chlamydomonas . Comparison of the ten investigated sample genes of Volvox with their orthologs in Chlamydomonas regarding alternative splicing events. A green background shows genes with alternative splice events, a red background indicates that genes do not exhibit alternative splicing. Numbers indicate the EST coverage of given genes in Volvox (V.c.) or Chlamydomonas (C.r.).