Table 1.

Published qualitative rat versus mouse species differences of relevance to pain.

difference	rat	mouse	reference
effect of isolation on morphine analgesia	decreases	increases	[35]
behaviour after cyclophosphamide cystitis	+abdominal crises	−abdominal crises	[36]
number of lumbar vertebrae	6	variable (5–6)	[37]
genes regulated by chronic pain (microarray)	43 genes (see main text)	10 genes	[38]
secretagogin expression in spinal cord	no colocalization	colocalized with CGRPc	[39]
TRPV1a expression in nociceptors	peptidergic only	peptidergic + IB4+b	(cf. [40])
traumatic brain injury-induced allodynia	unrelated to stress	dependent on stress	[41]

^aTransient receptor potential, V1.

^bIsolectin B4.

^cCalcitonin gene-related polypeptide.