   animation="property: rotation; dur: 5000; to: 0 360 0; easing: linear; repeat: indefinite;"
        >
        </a-entity>
      </a-marker>
      <!--Custom marker [C]-->
      <a-marker preset="custom" type="pattern" url="../assets/patt/C-90.patt">
        <a-entity
          gltf-model="#thymine"
          scale="0.1 0.1 0.1"
          animation-mixer
          animation="property: rotation; dur: 5000; to: 0 360 0; easing: linear; repeat: indefinite;"
        >
        </a-entity>
      </a-marker>
   