Conjoined twins is fusion, in which a fertilized egg completely separates, but stem cells (which search for similar cells) find similar stem cells on the other twin and fuse the twins together. Conjoined twins share a single common chorion, placenta, and amniotic sac, although these characteristics are not exclusive to conjoined twins, as there are some monozygotic but non-conjoined twins who also share these structures "in utero". The most famous pair of conjoined twins was Chang and Eng Bunker (Thai: อิน-จัน, In-Chan) (1811–1874), Thai brothers born in Siam, now Thailand. They traveled with P.T. Barnum's circus for many years and were labeled
Trigger Twins appears in The Multiversity Guidebook #1. The Trigger Twins are Justice Riders' members. In the second part of Arrowverse's "Elseworlds" crossover, John Deegan rewrites reality, turning Barry Allen and Oliver Queen into the Trigger Twins. Trigger Twins The Trigger Twins are the names of two sets of fictional Western themed comic book characters published by DC Comics. The Trigger Twins first appear in "All-Star Western" #58 (May 1951), the first issue of that title under its new name (previously known as "All Star Comics"), and was one of the features that replaced the previous stars, the Justice Society of America.