Under the selection pressure of crude toxin filtration, three kinds of treatment methods and four kinds of phytotoxin concentrations were used to screen the blast-resistant callus phenylalanine.
" How're you doing, Harry? " said the nearer of the two, grinning at him and holding out a large hand, which Harry shook, feeling calluses and blisters under his fingers.
In some ways the foot would become the shoe needed to make it through daily life because the body has the ability to build up calluses at the bottom of the foot.