Retrieving Values from nested Objects REST API SharePoint

Hi,

i'm struggling to figure out how to pull data from nested objects using the REST Api. i'm trying to retrieve the values of a category list from my blogs site which is a lookup column to the posts list in the blog. Issues is the values are nested deep within multiple objects. any help will do on how i can pull the highlighted values in the attached snippet.

var glblognews = function getBlogItems () {

         // execute AJAX request
        $.ajax({
            url: _spPageContextInfo.webAbsoluteUrl + "/Blog/_api/web/lists/getbytitle('Posts')/items?

$select=Title,PostCategory/Title,Region/Title&$expand=PostCategory,Region",
            type: "GET",
            headers: { "ACCEPT": "application/json;odata=verbose" },
            success: function (data) {

		var dataRes = data.d.results;
                var dataRes2;

              for (i=0; i< data.d.results.length; i++) {

		console.log(dataRes[i].Title);
		dataRes2 = dataRes[i].PostCategory;
		console.log(dataRes2);

             }

                  },
            error: function () {
            alert("Failed to get details");

            }
        });
    }

Any pointers will help please.

thanks