id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-004810-g0y7ied0	Lee, S. K.	S1 glycoprotein gene analysis of infectious bronchitis viruses isolated in Korea	2003-11-13		.txt	text/plain	3750	190	59	The S1 glycoprotein gene of IBV isolates were amplified by reverse transcriptase – polymerase chain reaction (RT-PCR) and analyzed by restriction fragment length polymorphism (RFLP) analysis. And these IBV isolates showed different patterns from each other and non-Korean IBV isolates in reverse transcriptase-polymerase chain reaction-restriction fragment length polymorphism (RT-PCR-RFLP) analysis [29] . Amplified S1 genes were first classified by RFLP analysis and then the representative strains were cloned, sequenced and compared to other non-Korean published IBV sequences. Phylogenetic trees were constructed from the nucleotide and deduced amino acid sequences of the S1 glycoprotein genes of Korean IBV isolates and non-Korean IBV strains (Fig. 3) . Korean IBV K281-01 and K210-02 isolates formed distinct clusters that were related to non-Korean IBV Ark99, Ark DPI, Gray and JMK strains although K281-01 and K210-02 isolates were classified into the Arkansas type by PCR-RFLP analysis.	./cache/cord-004810-g0y7ied0.txt	./txt/cord-004810-g0y7ied0.txt