Have confidence in your data. End your paper with one or two sentences in the discussion section using a strong, general statement from your observations. The researcher, with her introduction section, will guide the reader to his particular field of study. The introduction will provide the background information, what is already known about the particular study with sufficient sources and experimental models, and how this particular experiment fits into the general scheme. The introduction follows the opposite path of the discussion.
Information flows from the general to the particular.
The introduction should end with a statement that addresses the most important question in the study. It should be the definition of the problem. Experiments always involve manipulations to test scientific hypotheses, using controlled situations and changing one variable at a time. In the present study, a detailed examination of this region in Porcellio scaber was undertaken using SEM and TEM to determine if cells are present that lack a cuticular lining. All published information referred to in the text is listed alphabetically at the end of the paper by the first author's last name.