In its second announcement of the year, ReNeuron, the Surrey based stem cell developer, has announced new data on the stability of the company's CTX stem cell line.Researchers from University College London are due to tell a conference in San Diego that the results show "CTX cells retained their morphology and growth characteristics when exposed to the ... stresses that could be experienced during large-scale manufacture".Dr. John Sinden, Chief Scientific Officer of ReNeuron, commented:"These new research results demonstrate the robust nature of ReNeuron's CTX cell line when subjected to manufacturing scale-up stresses and thus the potential of this cell line to form the basis of a cell-based therapeutic product for wide-scale clinical application."The CTX cell line is currently in phase 1 clinical development as a therapy for patients disabled by strokes.ReNeuron shares have dropped 18% in the past 12 months, but are up on the week after the company announced positive study data on January 3rd for its ReN001 stem cell therapy for disabled stroke patients.Despite the positive announcement today, the shares eased back a tenth of a penny to 5.35p in the morning session.bs