Table 1.

A variety of cell-penetrating peptides mentioned in this paper.

CPP	Amino acid sequence	References
Viral or natural CPPs
HIV Tat	YGRKKRRQRRR	[31–35]
HIV Rev	TRQARRNRRRRWRERQR	[35]
FHV coat	RRRRNRTRRNRRRVR	[35]
HSV-1 protein VP22	DAATATRGRSAASRPTERPRAPARSASRPRRPVD	[34]
Penetratin	RQIKIWFQNRRMKWKK	[31, 33, 36, 37]
EB1 (penetratin analog)	LIRLWSHLIHIWFQNRRLKWKKK	[31]
MPG	GALFLGFLGAAGSTMGAWSQPKKKRKV	[31, 34, 38–40]
Polyarginines
PR9	FFLIPKGRRRRRRRRR	[41–44]
SR9	RRRRRRRRR	[31, 34, 41, 42, 45]
IR9	GLFEAIEGFIENGWEGMIDGWYGRRRRRRRRR	[46–48]
HR9	CHHHHHRRRRRRRRRHHHHHC	[41–44, 46]
Engineered CPPs
Transportan	CLIKKALAALAKLNIKLLYGASNLTWG	[31, 36]
CADY	GLWRALWRLLRSLWRLLWRA	[31, 49]
C6	RLLRLLLRLWRRLLRLLR	[13]
C6M1	RLWRLLWRLWRRLWRLLR	[13]
PF20 (and variants, see [9])	LLKLLKKLLKLLKKLLKLL	[9]
NAP	KALKLKLALALLAKLKLA	[9]
Steryl-NAP	Stearyl-KALKLKLALALLAKLKLA	[9]
POD	GGG[ARKKAAKA]4	[25]