MTResidue

Class MTResidue represents a group of atoms (3.8) forming a nucleic acid residue, an amino acid residue or a heterogeneous group (including solvent).

* read-only access
`-(MTChain*)chain`	access the parent chain (3.4) of which we are part
`-(NSString*)description`	returns a textual description of this residue
`-(NSString*)name`	returns the name
`-(NSString*)modname`	returns the name of the standard amino acid as the base of this modified residue. This is only used in case the residue is modified as indicated by MODRES entries in the PDB file.
`-(NSString*)moddescription`	returns the description of the modification as indicated by a MODRES entry in the PDB file
`-(NSString*)oneLetterCode`	Translate the name of this residue to the one letter amino acid code. If it is not known this returns @'X'.
`-(NSNumber*)number`	returns the number
`-(char)subcode`	This field is only used for distinguishing different residues of the same number. The PDB describes this as the insertion/deletion code.
`-(NSString*)key`	returns a concatenation of number and subcode, as this uniquely identifies this residue.
`-(int)sequenceNumber`	returns the residue's sequential number in the chains sequence. This number is set upon a call to Chain_getSequence or Chain_get3DSequence (3.4)
* tests
`-(BOOL)isStandardAminoAcid`	true if this residue is one of the 20 standard amino acids
`-(BOOL)isModified`	true if this residue is modified as indicated by a MODRES entry in the PDB file
`-(BOOL)isNucleicAcid`	true if this residue is a nucleic acid
`-(BOOL)haveAtomsPresent`	true if the connectivity of this residue's atoms is known to be correct
`-(double)distanceCATo: (MTResidue*)r2`	calculate and return the distance between the $C_{\alpha}$ atoms of the two residues. If the distance cannot be calculated due to missing atoms, the method returns -1.0.
* atoms
`-(id)addAtom: (MTAtom*)atom`	include new atom in the atom set of this residue
`-(NSEnumerator*)allAtoms`	return an enumerator over all atoms
`-(MTAtom)getAtomWithName: (NSString)name`	return atom (3.8) with the given name
`-(MTAtom*)getAtomWithInt: (unsigned int)number`	return atom with the given integer
`-(MTAtom)getAtomWithNumber: (NSNumber)number`	return atom with the given number
`-(MTAtom*)getCA`	special case of getAtomWithName:@'CA'
* manipulation
`-(id)transformBy: (MTMatrix53*)m`	transform (4.4) all atoms of this residue
`-(id)rotateBy: (MTMatrix44*)m`	rotates (4.3) all atoms of this residue
`-(id)translateBy: (MTCoordinates*)v`	translates (3.9) all atoms of this residue

res1 := currchain getResidue: '108' . " find residue. "

res2 := currchain getResidue: '47' . " find another residue. "

distance := res1 distanceCATo: res2. " calculate CA distance "