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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

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If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Cross-section of skin and a hair follicle. Note the shaft of the hair, the root, and papilla Cross-section of skin and a hair follicle. Note the shaft of the hair, the root, and papilla
Transduction Apparatus in Hair Cells Transduction Apparatus in Hair Cells
Rocking out, baby style: The author’s daughter dances at her first birthday party.    Rocking out, baby style: The author’s daughter dances at her first birthday party.   
Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ... Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ...
Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ... Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ...
Dodder (Cuscuta), also known as strangleweed or devil’s hair. This parasitic flowering plant has ... Dodder (Cuscuta), also known as strangleweed or devil’s hair. This parasitic flowering plant has ...
Video: Virtual Tour of the Eye Animation

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