Add a graphic for the experimental design

presentation.mkdn

@@ -207,20 +207,11 @@ unexplored
 
 ## Experimental design
 
-::: incremental
-
-* Separately isolate naïve and memory $\mathsf{CD4}^{+}$ T-cells from
-  4 donors
-
-* Activate with CD3/CD28 beads
-
-* Sample at 4 time points: Day 0 (pre-activation), Day 1 (early
-  activation), Day 5 (peak activation), and Day 14 (post-activation)
+\centering
 
-* RNA-seq + ChIP-seq of 3 histone marks (H3K4me2, H3K4me3, & H3K27me3)
-  for each sample.
+![](graphics/presentation/expdesign-CROP.pdf){ height=70% }
 
-:::
+\footnotesize
 
 Data generated by Sarah Lamere, published in GEO as
 [GSE73214](https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE73214)