TASK DEFINITION: In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.
PROBLEM: Todos los virus RNA (-) presentan

SOLUTION: All RNA (-) viruses present

PROBLEM: Es una molécula coestimuladora que se expresa en las células presentadoras de antígeno

SOLUTION: It is a costimulatory molecule that is expressed in the antigen-presenting cells

PROBLEM: La base de la teoría de Watson es la práctica enfermera centrada en

SOLUTION:
The basis of Watson's theory is the nurse practice focused on