Images Dated 6th February 2003

LARGE SCHOOLS OF BLACK MULLETS CREATE PATTERN IN TOKYO RIVER

Large schools of black mullets swarm in a pattern in a small river in
Tokyo February 6, 2003. The fish has increased in number by tens of
thousands after the river was recently purified, but the reason for
their sudden increase in volume remains a mystery. NO RIGHTS CLEARANCES OR PERMISSIONS ARE REQUIRED FOR THIS IMAGE
REUTERS/Toshiyuki Aizawa
TA/RCS - RP3DRIOZYDAA

Illustration of tissues of the pancreas

Illustration of tissues of the pancreas. Most of the pancreas is involved in secreting enzymes from clusters of gland cells (pancreatic acini), seen here coloured pink. However, the pancreas has two functions: secretion of digestive enzymes, and the production of hormones. Internal to the acini are yellow groups of cells named Islets of Langerhans. These are involved in the endocrine function of hormone production. Here, alpha cells (red) are involved in secreting glucagon. The numerous beta cells (yellow) secrete insulin. And delta cells (blue) secrete a hormone, somatostatin. The pancreas lies near the duodenum. A low production of insulin by the pancreas causes diabetes

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY