| Seven acellular gels were prepared as described above, but allowed to set for 30 min. |
| In 1996, the NVIC realized a major goal when the FDA licensed an improved pertussis vaccine known as the acellular pertussis vaccine. |
| The tumor cells were arranged in nests, with adjacent acellular myxoid areas. |
| In this example, the structure of the acellular periostracum has not been altered and the underlying tissue looks unaffected. |
| Microscopy revealed acellular laminated membranes with a germinal layer within the medullary cavity of the tibia and fibula. |
| Histopathologic examination of the biopsy tissue showed a granular, relatively acellular material filling the alveolar spaces diffusely. |
