ADD results paragraph for grex

tex/thesis.tex

@@ -1466,7 +1466,25 @@ for bead (\cref{fig:car_bcma_total}).
 
 \subsection{DMSs efficiently expand T cells in Grex bioreactors}
 
-% RESULT Grex bioreactor and luminex
+We also asked if the \gls{dms} platform could expand T cells in a static
+bioreactor such a Grex. We incubated T cells in a Grex analogously to that for
+plates and found that T cells in Grex bioreactors expanded as efficiently as
+bead over \SI{14}{\day} and had similar viability
+(\cref{fig:grex_results_fc,fig:grex_results_viability}). Furthermore, consistent
+with past results, \glspl{dms}-expanded T cells had higher \pthp{} compared to
+beads, but only had slightly higher \ptmemp{} compared to beads
+(\cref{fig:grex_phenotype}).
+
+% TODO is this discussion stuff?
+These discrepancies might be explained in light of our other data as follows.
+The Grex bioreactor has higher media capacity relative to its surface area, and
+we did not move the T cells to a larger bioreactor as they grew in contrast with
+our plate cultures. This means that the cells had higher growth area
+constraints, which may have nullified any advantage to the expansion that we
+seen elsewhere (\cref{fig:dms_exp_fold_change}). Furthermore, the higher growth
+area could mean higher signaling and higher differentiation rate to effector T
+cells, which was why the \ptmemp{} was so low compared to other data
+(\cref{fig:dms_phenotype_mem}).
 
 % TODO this figure has wonky proportions
 % TODO add stats for the phenotype stuff