When an allergic individual is exposed to a sensitizing allergen, the body makes a specific IgE, one that is able to recognize only that allergen. (see above chart). Millions of mast cells and basophils are all over the body.
Urban morphology is the study of the form of human settlements and the process of their formation and transformation. The study seeks to understand the spatial structure and character of a metropolitan area, city, town or village by examining the patterns of its component parts and the process of its development.
Urban morphology is, after all, the study of urban form, and an important part of urban design is the creation of urban form. It is reasonable that the discipline that has as its central purpose the understanding of urban form should contribute to both the theory and practice of designing that form.