Director/PDMR Shareholding

Stem Cell Sciences plc
23 December 2005

                                                                23 December 2005

                     Stem Cell Sciences plc (the "Company")

                       Extension of Option Exercise Dates


At a meeting of the Board of the Company held on 16 December 2005, it was agreed
that an extension would be granted to the existing option expiry date as
follows:

Option          Number of    Exercise   Date of        Original expiry   Revised expiry
Holder          options      price      Grant          date              date

The Mountford
Family Trust *  50,000       50p        23 June 2005   4 January 2006    18 July 2007

Hugh Ilyine     25,000       50p        23 June 2005   4 January 2006    18 July 2007


*Dr Peter Mountford, CEO, is connected to the Mountford Family Trust.


Contact:

Stem Cell Sciences plc                                             0131 662 9829
Susan Furber

Collins Stewart Limited                                            020 7523 8350
Tim Mickley



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