code: public static int countGC(Sequence<NucleotideCompound> sequence) {
  		CompoundSet<NucleotideCompound> cs = sequence.getCompoundSet();
  		NucleotideCompound G = cs.getCompoundForString("G");
  		NucleotideCompound C = cs.getCompoundForString("C");
  		NucleotideCompound g = cs.getCompoundForString("g");
  		NucleotideCompound c = cs.getCompoundForString("c");
  		return countCompounds(sequence, G, C, g, c);
  	}
docs: Returns the count of GC in the given sequence
  
  @param sequence The {@link NucleotideCompound} {@link Sequence} to perform
  the GC analysis on
  @return The number of GC compounds in the sequence