Удаление текста внутри скобки из определенных строк в фрейме данных

#r #dataframe Вопрос: Итак, это мой образец фрейма данных dput(aa) structure(list(V4 = structure(1:22, .Label = c("Peak228404", "Peak228411", "Peak228413", "Peak228423", "Peak228424", "Peak228439", "Peak228461", "Peak228476", "Peak228479", "Peak228495", "Peak228528", "Peak228553", "Peak228603", "Peak228612", "Peak228629",…