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Wed 10 Nov, 2010 05:33 am
The components = the hormones, growth factors and several proteins ?
Context:
Science News Share Blog Cite Print Email BookmarkMicroRNA Controls Mammary Gland Development in Mice: Novel Mechanism for Vertebrate Organ Development
ScienceDaily (Nov. 9, 2010) — Hormones, growth factors and several proteins ensure that development occurs in the right way, at the right time. The components that cause breast development in mammals, for example, were thought to be largely known. However, as a team of scientists from Göttingen, Frankfurt and Hanover have now discovered, in the case of breast development, hormones and proteins do not account for the full story. The scientists have shown that tiny ribonucleic acid molecules play a key role in this process. The mammary glands of mice lacking the gene for the microRNAs 212 and 132 failed to grow at puberty.
Well, yes, but the point of the story is that scientists in Germany have discovered that there are other components than those you have mentioned which play a part in the development of the breast--specifically, RNA factors.