Sentence:  The specific staining by both direct and indirect <WSD>methods</WSD> showed that WTV antigen was concentrated in the pseudophloem tissue and in a few thick walled cells in the xylem region , but was not detectable in any other tissues of the root and stem tumors . 
Meaning of the word marked with <WSD> tags:  a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps)