In mathematics, the Fibonacci numbers or Fibonacci series or Fibonacci sequence are the numbers in the following integer sequence: (sequence A000045 in OEIS) By definition, the first two numbers in the Fibonacci sequence are 0 and 1, and each subsequent number is the sum of the previous two.
Tight Junctions. Tight junctions are found predominantly in epithelial tissues, such as intestinal brush border. Water and other fluids must be prevented from leaking between adjacent cells, so that body fluids do not gradually seep across the intestinal lining.
Epithelial cells are held together by strong anchoring (zonula adherens) junctions. The adherens junction lies below the tight junction (occluding junction). In the gap (about 15-20nm) between the two cells, there is a protein called cadherin-a cell membrane glycoprotein.(The type of cadherin found here is E-cadherin). occluding junctions (zonula occludens or tight junctions). 2  adhering junctions (zonula adherens). 3  desmosomes (macula adherens). 4  There are also ' hemidesmosomes ' that lie on the basal membrane, to help stick the cells to the underlying basal lamina.