This is the end of the exercise.
Hopefully, you have learned more about the big questions of growth during development, have learned more about the scientific process in which hypotheses are suggested, experiments done and the conclusions drawn from the data.
It is important to note that this practical has introduced some simple ideas about control of growth. The real examples - even the imaginal discs and certainly the fish - will be more complicated than implied by the exercises here, with multiple gradients and with cells' sensitivity to them being altered by differentiation state. It is probably true to say that we still do not fully understand growth control in any biological system.
Enjoy the rest of your developmental studies!
Jamie Davies, Professor of Experimental Anatomy.