As degranulation occurs, it causes the mast cell or basophil to release a series of chemicals that orchestrate the allergic reaction. Within every mast cell or basophil are 500 to 1500 granules containing more than thirty different allergy-causing chemicals.
Urban design is an inter-disciplinary subject that unites all the built environment professions, including urban planning, landscape architecture, architecture, civil and municipal engineering.
These urban mall designers elide the realities of the city's negative aspects: rain is kept out, traffic is kept underground or to the borders and the urban underclass is tactfully, if not tastefully, invisible.