This is a preview. Log in through your library . Abstract The courses of the main lines and patterns of palmar regions of 150 patients with Down's syndrome (all with free trisomy 21) were examined.

Microscopic fossils found in China emerge as the oldest examples of animals that display bilateral symmetry -- two halves that are mirror images of each other. The find by a USC paleontologist and his ...

Tsukuba, Japan—In nature, flowers may share morphological features, even across distantly related species. Bilateral symmetry is one such feature found in flowers of various taxa, such as orchids and ...