Indicate true (T) and false (F) statements below regarding viral cell entry. Your answer would be a four-letter string composed of letters T and F only, e.g. FFTF. ( ) Endocytosis inhibitors can block HIV entry but not influenza virus entry. ( ) Adenovirus infection is blocked by membrane-fusion inhibitors. ( ) Individuals with a defective CCR5 gene are more susceptible to HIV infection. ( ) Most viruses enter the host cell by phagocytosis.