An integrated circuit having a crack detection structure. The vent fan is driven by a fan motor to generate air current for introducing and exhausting contaminated air, and includes an air outlet through which the contaminated air is exhausted. Further, the shape of the UBM is adapted to the shape of the corners. This auxiliary data is still current and relevant to the retailer and the particular market segment or category that the retailer is attempting to exploit. The results for each community may be further analyzed relative to each other. This invention also provides the above-described vectors, wherein the gene encodes a product toxic to cells or an intermediate to a product toxic to cells.