Exhibit A Joint Filing Agreement

Exhibit A

Joint Filing Agreement

     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other of a statement on Schedule 13D (including all amendments thereto) (the “Statement”) with respect to the common stock, par value $0.001, of Sequenom, Inc., and further agree that this Joint Filing Agreement be included as an exhibit to such Statement. In evidence whereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of this 21st day of May, 2008.

	SIEMENS VENTURE CAPITAL GMBH
	By:	/s/ XX. XXXX XXXXXXX
		Name:	Xx. Xxxx Xxxxxxx
		Title:	CEO
	By:	/s/ XXXXXX XXXXXXXXX
		Name:	Xxxxxx Xxxxxxxxx
		Title:	CFO
	SIEMENS BETEILIGUNGEN INLAND GMBH
	By:	/s/ CHRISTIAN HOMERING
		Name:	Christian Homering
		Title:	Managing Director
	By:	/s/ XX. XXXXX X. XXXXXXX
		Name:	Xx. Xxxxx X. Xxxxxxx
		Title:	Managing Director
	SIEMENS AKTIENGESELLSCHAFT
	By:	/s/ XXXXXXX XXXX
		Name:	Xxxxxxx Xxxx
		Title:	Managing Director and CEO Siemens Financial Services GmbH

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	By:	/s/ SOLMS X. XXXXXX
		Name:	Solms X. Xxxxxx
		Title:	General Counsel Corporate and SFS

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