src/viewer.js
function(name, structure, opts) {
    opts = opts || {};
    opts.forceTube = true;
    return this.cartoon(name, structure, opts);
  }
function(name, structure, opts) {
    opts = opts || {};
    opts.forceTube = true;
    return this.cartoon(name, structure, opts);
  }
function ( name , structure , opts ) { opts = opts || { } ; opts . forceTube = true ; return this . cartoon ( name , structure , opts ) ; }
renders the protein using a smoothly interpolated tube, essentially identical to the cartoon render mode, but without special treatment for helices and strands.
renders the protein using a smoothly interpolated tube essentially identical to the cartoon render mode but without special treatment for helices and strands .