While teaching about the cry genes and the Cry proteins in Biology class, my teacher told us that the names of genes are always written in lowercase and should be italicized, and the name of protein coded by that gene should always start with a capital letter.
Now, while reading the notes taken in the same lectures, I am wondering whether the name of the genes should be underlined while handwriting, as we use to do while writing the biological names; or are there some other rules related to it?
Moreover please tell me that is it really necessary to write the name of a protein (I am talking about every protein) always with a capital letter at start?