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Extracts the sequence environment around a given position.
env.extract(seq, c, r)
a string protein sequence.
center of the environment.
radius of the environment.
Returns a a strings with the extracted environment sequence.
Aledo et al. Sci Rep. 2015; 5: 16955. (PMID: 26597773)
env.matrices(), env.sp()
# NOT RUN { env.extract('ARGGQQQCATSYV', c = 8, r = 2) # }
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