No, there is a rex gene too. I don't know about mice colours/coat patterns myself, they ones I have bred I have done so for pet only. The way I understand it is that astrex is a mouse with one rex gene and a rex has two rex genes. Though I could be totally wrong on that! I do know that the rex coat is curlier and the curls last longer. You find with the astrex that the curls drop out over time and the mouse just looks 'scruffy'.
Mouse smell isn't a problem once you get into a cleaning routine. They do smell more than hamsters, especially the males. The need regular cleaning, but not thorough cleans. If you scrub a male tank so it is spotless, they will scent mark it which stinks! So regular little cleans works a treat.
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