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Ecotropic MuLV in astrocyte cell lines and supernatant of SAMR1, SAMP8 and ICR mice.
| Cell lines | Infectivity* | |
| Cells | Supernatant | |
| R1A1 | - | - |
| R1A2 | - | - |
| R1A5 | - | - |
| P8A1 | + | + |
| P8A7 | + | + |
| P8A9 | + | + |
| ICR-A1 | - | - |
| ICR-A2 | - | - |
| ICR-A3 | - | - |
* Plaque-forming units (PFU)/ml
+ indicates a titer higher than 104/ml.
- indicates no demonstrable virus even in undiluted material.
