c("pre- or post-challenge: Pre", "tissue: whole blood")
c("pre- or post-challenge: Post", "tissue: whole blood")
c("pre- or post-challenge: Pre", "tissue: whole blood")
c("pre- or post-challenge: Post", "tissue: whole blood")
c("pre- or post-challenge: Pre", "tissue: whole blood")
c("pre- or post-challenge: Post", "tissue: whole blood")
c("pre- or post-challenge: Pre", "tissue: whole blood")
c("pre- or post-challenge: Post", "tissue: whole blood")
c("pre- or post-challenge: Pre", "tissue: whole blood")
c("pre- or post-challenge: Post", "tissue: whole blood")
c("pre- or post-challenge: Unchallenged control", "tissue: whole blood")
c("pre- or post-challenge: Unchallenged control", "tissue: whole blood")