 It has been assumed that combinations of protein transcription factors (TFs) generate a large enough address space to form gene regulatory networks that are complex enough to control the development of complex multicellular life.
<clarity>  It has been assumed that combinations of protein transcription factors (TFs) generate a large enough address space to form gene regulatory networks that are complex enough to control the development of complex multicellular life.
 It has been assumed that combinations of protein transcription factors (TFs) generate a large enough address space to form GRNs that are complex enough to control the development of complex multicellular life.