ApexX, funny you should mention that because Anavar is often used in treatment of short stature, for example oxandrin and growth hormone are used for girls with Turner Syndrome - to help them grow taller.
ttp://www.emedicinehealth.com/articles/34966-6.asp
UA iron - I may be wrong but estrogen does not directly stop the growth, it induces senescence - sort of a sleep like state- in chondrocytes (the bits of a special type of cartilage that grow into bone, when the chondrocytes "go to sleep" bone growth is over). Its kind of like estrogen starts taking to the growing bone: "hi bone, did I tell youa bout my newest maybelline eye shadow, its great...and the other day I saw katie at the mall and I said "hi Katie.." but really I wanted to say Katie you big fat slut...oh I am on this new diet and yesterday I ate a cup of rice, 4 raisins, and a small piece of tuna...do you ever watch Oprah?....." - and this puts the chondrocytes to sleep and the bone stops growing.