A better way of studying frogs

I was reading Daily Express posted on Oct 1st, when one of this article title 'No need for dissection as see-through frogs jump in' caught my attention. It was about Japanese researchers at Tokyo that produced see-through frogs letting them observe organs, blood vessels and eggs under the skin without preforming dissection. Two kinds of recessive genes have been known to cause the frog (Rena japonica, rare mutant of Japanese brown frog) to pale. Two frogs with the recessive genes were crossed which produced offspring that looked normal. Crossing the offspring led to a frog whose skin is transparent from the tadpole stage. The researchers can see changes of organs when tadpoles mutate into frogs. Transparent frog can also reproduce, but their grandchildren die shortly after birth.

It's amazing as a new way to be able to observe the development of the internal body through time. Researchers also can see at what stage the cancer starts. However, its unrealistic to apply same method to mammals as their skin structure is different.