Holding(s) in Company

Stem Cell Sciences plc 08 April 2008 For Immediate Release 8th April 2008 Stem Cell Sciences plc Holding(s) in Company TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: Stem Cell Sciences plc 2. Reason for the notification (place an X inside the appropriate bracket/s) An acquisition or disposal of voting rights: (X) An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: ( ) An event changing the breakdown of voting rights: ( ) Other (please specify) : ( ) ................. 3. Full name of person(s) subject to the notification obligation: AIM Realisation Fund Limited 4. Full name of shareholder(s) (if different from 3.) : 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 31/03/08 6. Date on which issuer notified: 08/04/08 7. Threshold(s) that is/are crossed or reached: 7% 8. Notified details: ................. A: Voting rights attached to shares Class/type of shares if possible using the ISIN CODE: GB00B0BZYL27 Situation previous to the Triggering transaction Number of shares: 2,674,239 Number of voting Rights: 2,674,239 Resulting situation after the triggering transaction Class/type of shares if possible using the ISIN CODE: GB00B0BZYL27 Number of shares: 1,974,239 Number of voting rights Direct: 1,974,239 Indirect % of voting rights: 5.89% B: Financial Instruments Resulting situation after the triggering transaction Type of financial instrument Expiration Date Exercise/Conversion Period/ Date Number of voting rights that may be acquired if the instrument is exercised/ converted. % of voting rights Total (A+B) Number of voting rights: 1,974,239 % of voting rights: 5.89% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will cease to hold: 12. Date on which proxy holder will cease to hold voting rights: 13. Additional information: Shareholding based on total voting rights of 33,516,149 ................. 14. Contact name: Giorgio Reggiani, Finance Director, Stem Cell Sciences Plc 15. Contact telephone number: +44 (0)1223 499160 - Ends - This information is provided by RNS The company news service from the London Stock Exchange

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