Add some notes on what to expand on in the intro

thesis.lyx

@@ -766,6 +766,19 @@ literal "false"
 Diagnosis and treatment of allograft rejection is a major challenge
 \end_layout
 
+\begin_layout Standard
+\begin_inset Flex TODO Note (inline)
+status open
+
+\begin_layout Plain Layout
+Maybe talk about HLA matching and why it's not an option most of the time.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
 \begin_layout Standard
 To prevent rejection, allograft recipients are treated with immune suppressive
  drugs 
@@ -932,6 +945,20 @@ literal "false"
 Memory cells are resistant to immune suppression
 \end_layout
 
+\begin_layout Standard
+\begin_inset Flex TODO Note (inline)
+status open
+
+\begin_layout Plain Layout
+Expand on costimulation required by naive cells and how memory cells differ,
+ and mechanisms of immune suppression drugs 
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
 \begin_layout Standard
 One of the defining features of the adaptive immune system is immune memory:
  the ability of the immune system to recognize a previously encountered