A Chimera is a mythical creature from ancient Greek mythology, often depicted as a hybrid of multiple animals. Typically, it has the body of a lion, the head of a goat protruding from its back, and a tail that ends with a snake's head. This fantastical being symbolizes chaos and the blending of different elements. In modern science, the term "chimerism" refers to an organism that contains cells from two or more genetically distinct sources. This can occur naturally, such as in twins that share cells, or artificially, through genetic engineering. Chimeras in biology help researchers understand development and disease.