If liver cells and eye cells have the same transcription factor, why isn't the liver gene expressed in your eye cells?

Expression of each gene requires a unique combination of multiple transcription factors.  Expressing a gene all the time, regardless of conditions, Pax-6 is highly conserved and shows shared evolutionary ancestry. cytoplasmic determinants that are distributed unevenly in the unfertilized egg inductive signals from one cell to another. Gradients of molecules in developing tissues. the products of regulatory genes.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.