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.
1 Specialized contacts â epithelial cells fit close together and form continuous sheets (except in the case of glandular epithelia). 2  They do this with t ight junctions and desmosomes. 3  Tight junctions form the closest contact between cells and help keep proteins in the apical region of the plasma membrane.