Helicobacter pylori virulence factor CagA (cytotoxin-associated gene A) is a 120-145kDa protein encoded on the 40kb cag pathogenicity island (PAI). H. pylori strains can be divided into CagA positive or negative strains, of which around 60% of H. pylori isolates in Western countries are positive, whereas the majority of East Asian isolates are.

Enga (also Caga, Tsaga, Tchaga) is a language of the East New Guinea Highlands that is spoken by approximately 180,000 people in Enga Province, Papua New Guinea. It has the largest body of speakers of any native language in New Guinea.

Tzachas (, Tzachas), also known as Chaka Bey or Emmir Chaka of Smyrna, was an 11th-century Seljuk Turkish emir who ruled an independent state based in Smyrna (present day Izmir).