What are the types of Allergy on the basis of period of allergy
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There are two types: seasonal, which occurs only during the time of year in which certain plants pollinate, and perennial, which occurs year-round. Pollen Allergies More than 25 million Americans are allergic to pollen from trees, grass, or weeds.

Explanation:

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.