In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.

Las proteínas transmembrana que se unen a proteínas intracelulares y extracelulares son
The transmembrane proteins that bind to intracellular and extracellular proteins are

Los cuerpos de Negri son masas de partículas víricas visibles al microscopio óptico en las células infectadas por el virus de
The bodies of Negri are masses of viral particles visible under an optical microscope in cells infected by the virus

La α-queratina consta de

The α-keratin consists of