Varicella (chickenpox) , rubella, hepatitis A, shingles and one preparation of rabies vaccine are all made by growing the viruses in fetal embryo fibroblast cells. Fibroblast cells are the cells needed to hold skin and other connective tissue together.
Character (arts) A character (sometimes known as a fictional character) is a person or other being in a narrative work of art (such as a novel, play, television series, video game, and film). The character may be entirely fictional or based on a real-life person, in which case the distinction of a fictional versus real character may be made.
A character class is defined by the abilities that it lends to a character  as such, two different characters with the same class are theoretically interchangeable, in that they have the same power set and can play the same role in the game because of their similar abilities.