Addendum No. 4 to the Lease Agreement from 01/28/2011 between 4-Antibody AG, Hochbergerstr. 60C, 4057 Basel (Sublessee) and Technologie Park Basel AG, Hochbergerstr. 60C, 4057 Basel (Principal Lessee)

Addendum No. 4 to the Lease Agreement from 01/28/2011 between

4-Antibody AG, ▇▇▇▇▇▇▇▇▇▇▇▇▇. ▇▇▇, ▇▇▇▇ ▇▇▇▇▇

(Sublessee)

and

Technologie ▇▇▇▇ ▇▇▇▇▇ ▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇▇. ▇▇▇, ▇▇▇▇ ▇▇▇▇▇

(Principal Lessee)

The parties mentioned above agree as follows with regard to the maintenance of air-conditioners in the rooms rented by 4-Antibody AG and concerning the provision of the autoclave and ice machine to other tenants of Technologie Park Basel:

1. The autoclave and the ice machine can be installed in Room C3_67 and used in agreement with 4-Antibody AG by all tenants of the Technologie Park (as of May 2013) within regular scope. 4-Antibody AG may charge them for the operating costs.

2. The responsibility for the autoclave and the ice machine lies with 4-Antibody AG. For example, the costs of maintenance and repairs of these devices shall be covered by 4-Antibody AG. However, if one of these devices breaks and cannot be repaired anymore, 4-Antibody AG is not obliged to purchase a new device.

3. The air-conditioners in Rooms C3_23, C3_25, C3_31 belong to 4-Antibody AG. The costs of repair, replacement, or the costs resulting from the breakdown of these devices shall be borne by 4-Antibody AG.

4. In return for 4-Antibody AG providing the autoclave and ice machines at the disposal of the other lab tenants, TPB AG shall assume the costs of regular maintenance of the air-conditioners in these rooms. (As of May 2013, this is performed by ▇▇▇▇▇▇▇ Controls)

4-Antibody AG	Technologie Park Basel AG
Basel, on [hw:] 06/06/2013	Basel, on [hw:] 06/24/2013
[signature] Dr. ▇▇▇▇▇▇ Burns Chief Executive Officer	[signature] ▇▇▇▇▇▇ Hess VR1
[signature] ▇▇▇▇▇▇▇ Princip Group Head of HR	[signature] Nina Ryser VR2