Define model and non-model systems and how they relate to translational science.
You should have a section that defines model systems with specific examples including their unique strengths and weaknesses.
This should be followed by a section that defines and compares them to non-model systems, again, their unique strengths and weaknesses.
The second half of your paper should be a discussion regarding how both systems can help us to discover important cellular and molecular characteristics of regenerative biology and with that how those characteristics can be applied to regenerative medicine.
In the conclusion of your paper, you should be able to answer the question: How can exploring both model and non-model systems help us to address important clinical challenges for patients in the future. To wrap this up, pick one disease or injury to build your discussion upon.