Call your doctor if your baby: 1  Is under 3 months old and has a temperature over 100.4 F. 2  Is over 3 months old and has a fever over 102 F. 3  Has a fever that lasts longer than 24 hours.  Has diarrhea, vomiting, or a rash with the 1  fever. Is very sleepy or looks sick.  Can't be soothed.
There is two main pigments found in human hair: Eumelanin has an oval or elliptical shape, which gives color to brown or black hair and is dark pigment. The higher the concentration of Eumelanin the darker the hair. Pheomelanin is what produces the color in blonde or red hair.
Hair Color â¢ Hair color is due to amount and type of melanin in the keratinized cells. â¢ Melanocytes in the matrix of the bulb synthesizes melanin. â¢ Melanin passes into the cortex and medulla of the hair. â¢ Dark hair contains true melanin â¢ Blond and red hair have variants of melanin in which there is iron/sulfur.