skeleton
• with doxycycline treatment from E15.5 on, columnar zones are shortened in growth plates of mutants
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• with doxycycline treatment from E15.5 onward, severe dwarfism results
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• endochondral bones stop elongating by E17.5 with doxycycline treatment from E15.5 onward
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• chondrocytes lose ability to enlarge by E17.5 when doxycycline treatment takes place from E15.5 onward
• columnar cells stop proliferating at a rate 3 times greater than control cells with doxycycline treatment starting at E15.5; number of apoptotic cells in the columnar zone of growth plates is about 28 fold higher and about 5 times higher in the prehypertrophic zone of controls with 2 days of doxycycline treatment
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