Indicate true (T) and false (F) statements below regarding developmental timing in animals. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTT.
( ) Cell-division cycles generally serve as an intracellular timer that controls the timing of cellular differentiation.
( ) Developmental transitions are often regulated by microRNAs.
( ) Intracellular developmental programs are often followed even if the cells are taken from the developing embryo and maintained in culture.
( ) Timing of developmental transitions can be coordinated by cell-cell interactions as well as globally by hormones.