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xp198766

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gastrodia

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wangleisdnu

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rainwander(½ð±Ò+2):¹ÄÀø»ý¼«²ÎÓë~ 2010-12-08 08:15:07
Non-radioactive RNA fingerprint procedure
First strand cDNA synthesis was performed with 15 mg of total
RNA, 500 pmol oligo(dT)18 and 800U Superscript II reverse
transcriptase (Life Technologies) in a volume of 100ml RT
buffer, following the manufacturer¡¯s instructions. After heat
inactivation of reverse transcriptase and RNase A digestion,
reaction products were purified from excess oligonucleotides
by using a QIAquick kit (Qiagen). cDNA derived from 75 ng of
total RNA was used as template for PCR. Amplification was
performed in 20 ml of PCR buffer (10mM Tris-Cl pH 8.3,
50mM KCl, 1.5mM MgCl2) with 125mM dNTPs (Pharmacia)
and 1mM each primer. For each reaction, two 18-mer
oligonucleotides, of arbitrary sequence and a GC content of
61%, were used. Sequences of all 131 oligonucleotides used
in this screen can be obtained upon request. All PCR
amplifications were performed on an Omni-Gene thermal
cycler (Hybaid). After 2 min of denaturation at 948C, 2 units of
Taq DNA polymerase (Roche) were added (manual ¡®hot
start¡¯). After 1 min at 948C, the profile was started with two,
low-stringency cycles (948C for 1.5 min, 508C for 3.5 min and
728C for 3 min) followed by 35¨C40 high-stringency cycles
(948C for 1 min, 658C for 1 min, and 728C for 1 min), and a final
5 min extension at 728C. Reaction products were separated
on 2% SeaKem LE agarose gels (FMC) for 3.5 h at 6¨C
7Vcm21 and 88C. Gel and running buffer was 0.5X TBE
(50mM Tris-borate pH 7.9, 1mM Na2-EDTA) containing
5mgml21 ethidium bromide. Bands of interest were excised,
DNA was eluted with a Jetsorb kit (Genomed) and the
amplicons were cloned directly by using a Topo TA cloning kit
(Invitrogen).

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