Tag abundance versus log fold change, log (fc), between major ampullate (MA) glands and cephalothoraxes. Tags included are only those that matched a reference gene. Tag abundance, log (cpm), is the natural log of average counts of that tag per million total tags (cpm) among all four libraries. Tags that are differentially expressed between MA glands and cephalothoraxes (FDR ≤ 0.05) are bolded. Turquoise tags matched the sense strand and salmon tags matched the antisense strand. A positive log (fc) indicates higher abundance in MA glands.