What's wrong with testing various experimental drugs or procedures on animals? As unethical as it may seem or sound, its a price that can be considered extremely low when we look at it from a macro view point.
Would you rather have procedures and drugs tested on animals, before testing on live human test subjects, or skip the whole animal stage and jump to live human subjects? Before you make a comment like "Of course I'll support skipping the animal stage!", just imagine if you, or any of your siblings/parents/relatives are the human subjects, and there's no guarantee that the drugs or procedures will work, or are 100% safe. Would you be willing to take this risk and give them the green light?
Furthermore, there's no evidence in the passage that suggested any form of animal cruelty, or pain to the two cats involved. The only procedure involved was the manipulation of the animal's gene, which was most probably done after a sample was taken from the original test subject (don't quote me, i'm not a lifescience student)
For those who feel so strongly about animal rights and all that jazz,
"The ability to produce cloned cats with the manipulated genes is significant as it could be used for developing treatments for genetic diseases and for reproducing model (cloned) animals suffering from the same diseases as humans," it added."
I guess the scientists shouldn't apply any beneficial procedure on animals suffering from various genetic diseases as that would be tantamount to playing God... since God made animals the "weaker species" (as mentioned in one of the posts), and we "shouldn't play God", then we probably shouldn't provide such unethical treatment for animals, and just apply it solely on humans.