Helix 1-3 is an N-terminal that is composed of three antiparallel helices that are arranged in an up, down, up pattern. Helix 4 is a C-terminal made up of an antiparallel β sheet which is composed of five β strands. On one side of the C-terminal, there is a shorter N-terminal helix and a long C-terminal helix.
Helix 1-3 is part of the N-terminal region made up of three antiparallel helices in an up-down-up sequence. Helix 4 forms the C-terminal with an antiparallel β sheet containing five strands. On one side of the C-terminal, there are shorter and longer N-terminal helices.