A partial or total loss of smell—called anosmia—can happen for many reasons—including having COVID-19. Loss of smell can also affect your sense of taste. In fact, the two senses are so closely ...
The intensity of hair color depends on the density of pigment within the melanosome. Both eumelanin and pheomelanin are made from the amino acid tyrosine, using the enzyme tyrosinase. Increased ...