How would you summarise an investigative report on LSD effects on rat brains

How would you summarise an investigative report on LSD effects on rat brains – I have got most of the information and have tried to find examples of what to include but my report reads more essay-like.  Any advice on setting it up, pointers on info, and what should be included would be helpful, also any examples available online to search for ideas would be great.  Thanks