code: def align_and_build_tree(seqs, moltype, best_tree=False, params=None):
      
      aln = align_unaligned_seqs(seqs, moltype=moltype, params=params)
      tree = build_tree_from_alignment(aln, moltype, best_tree, params)
      return {'Align':aln, 'Tree':tree}
docs: Returns an alignment and a tree from Sequences object seqs.
  
      seqs: a cogent.core.alignment.SequenceCollection object, or data that can
      be used to build one.
  
      moltype: cogent.core.moltype.MolType object
  
      best_tree: if True (default:False), uses a slower but more accurate
      algorithm to build the tree.
  
      params: dict of parameters to pass in to the Muscle app controller.
  
      The result will be a tuple containing a cogent.core.alignment.Alignment
      and a cogent.core.tree.PhyloNode object (or None for the alignment
      and/or tree if either fails).