Which Rato de estimação breeds come in Bareback?

Club breed standards describe Bareback for the Rato Doméstico.

Rato de estimação pattern

Bareback

Rat marking: a colored hood over the head, neck and shoulders with no stripe down the back, the rest white (AFRMA Bareback, NFRS provisional).

1 Rato de estimação breed lists Bareback. It is in a club standard for 1 breed.

Breed	AFRMA	NFRS
Rato Doméstico	Padrão (“Bareback”)	Alternativo (“Bareback (provisional)”)