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Chronic constipation can obstruct the bowels, while chronic diarrhea can make it difficult for a person to absorb necessary nutrients from food

Researchers looked at nearly 700 long-term heavy smokers in England who wanted to kick the habit

These advancements have demonstrated that the respiratory tract is not devoid of microorganisms, but rather supports a complex and diverse microbiome across both the upper and lower airways [36,37,38]

The libraries were further quantified on a Qubit 2.0 fluorometer using Qubit dsDNA HS kit (Life Technologies, USA) and by quantitative PCR (qPCR) using KAPA SYBR FAST qPCR Master mix and Illumina standards and primer premix (KAPA Biosystems, Wilmington, MA, USA), following the Illumina-suggested protocol