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Brown adipose tissue as a derivative of mesoderm grafted below the kidney capsule A model for differentiation of isolated rat mesoderm

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Figure

Fig. 1. Egg-cylinderof nine-day-oldprommentrat embryo.The embryonicpart occupiesthe antenorpart of the egg-cylinder(left), wherethe neural groove is(arrow'
Fig, 5. Experimentallydevelopedbrownadiposetissue one monthafter graftingof mesodermbelowthe kidney capsule
Fig. 21. Theamountparticlesandof UCP(measuredas thenumberof UCP-goldper J.lm2 mitochondrialcristae)in experimentallydevelopedBAT in ratsexposedto differenttemperaturesor in ratsinjectedwithnoradrenaline.One monthafter graftingof mesodermbelowthe kidneycapsule.rats beanngBA T-tumorswere separatedmto three groups(threeratspergroup).The f/fstgroupremainedcagedat roomtemperature(20:!2~C).The secondgroupofratscagedat roomtemperaturewasinjectedwith noradrenaline(NA) (5 pmol.noradrenaline/kgbody weight perday) for 4 days.The third groupof rats was exposedto cold stress(+~C -2Cf"C) for one week.Numbersof UCP-goldparticlesf:t SD.) per JIm2of mitochondnalcristae are UCP-goldparticles(subtractedfor backgroundlabeling)labeledover mirochondnalcristae.Mitochondriaof experimen-tal/y developedbrownadipocytescontammoreUCP than mitochondnaofinterscapularbrownadipocyteswhichserveas a positivecontrol.TheinjectionofNAincreased(butnotsignificantly)theamountofVCP.SignificantincreaseofVCPpermitochondrialCflstaeis recordedinmitochondnaof brownad,pocytesof cold--e.;;posedrats.
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