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Nuclear transfer method: Nuclear transfer will extend the range of species in which gene targeting will be possible and thereby provide better models to test treatments for human diseases. The production of Dolly followed by subsequent confirmation in cow and mice successfully established a cloning technology, which have opened the new horizons of application of nuclear transfer technique in production of transgenic animals. Current available technique of pronuclear microinjection of a DNA expression cassette is inefficient and expression levels are unpredictable. Nuclear transfer (cloning) offers an appealing alternative. Hence, one could perform gene targeting in cell lines that is able to donate its nuclei to recipient oocytes. This would allow selection of the most productive cell line showing high expression for conversion into highly productive animals, and all animals will be transgenic. For example, the time from microinjection to a milk producing flock is 3.5 years, if the founder is female, and 2.5 years, if it is male. With somatic cloning this time can be reduced to 1.5 years. This saving of time will be greater with cow. Production of transgenic founder animals by nuclear transfer also uses less than half the number of experimental animals than a pronuclear injection.
Requirements of Dental implants Dental implants require special oral hygiene techniques. The particular technique chosen often depends upon the prosthesis. A removable prosth
Q. Is there an exchange of cells between the mother and the fetus through the placenta? Under usual conditions there is no passage of cells across the placenta during gestation
Response to Wounding Wounding of tomato plants by mechanical injury or chewing by insects releases a factor that triggers accumulation of two proteinase inhibitors-throughout
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EA R It is phono receptor as respond to sound waves. It is teloreceptor as receive stimuli from far distance. It is stato-acousting organ as concerned with b
Tunnel Subvalvar Stenosis : This variety is less common and extends from sub aortic area for a variable length of 10-30 mms (tunnel stenosis). In the severe variety, the tun
Why does the recombination frequency of genes vary with the distance between them in the chromosome? The farther the distance among the loci of two genes in a chromosome the hi
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Symptoms refer to the problems expressed by the patients. Signs are obtained by a health professional from the patients by interacting with him, by conducting tests, etc. The sympt
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