advanced amino acid sequence information

Note that the sequence discussed here is that for which coordinates are available. It may differ from the sequence of the SEQRES fields (see the seqres method).

Two methods are provided: aaseq and frgseq.

• aaseq: It will return a string of the sequence encoded using a 1 letter code. It will not consider the different chains or fragments.
• frgseq: It will return a list of strings of the sequence encoded using a 1 letter code. Each string corresponds to a fragment. Since it performs fragment detection first, two arguments maxNCDist and maxCADist correspond to the arguments of frgList(), with the same default values.