CUSIP No. 15708Q105 13G Page 1 6 of 20 Pages

Exhibit 1

AGREEMENT

Pursuant to Rule 13d-1-(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of shares of stock of Cerulean Pharma Inc.

This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

Dated: April 18, 2014

Lux Ventures II, L.P.
By:	Lux Venture Partners II, L.P.
	its General Partner
	By:	Lux Venture Associates II, LLC
		its General Partner
	By:	Lux Capital Management, LLC
		its Sole Member
		By:	*
			Name: Robert Paull
			Title: Managing Director
Lux Ventures II Sidecar, L.P.
By:	Lux Venture Partners II, L.P.
	its General Partner
	By:	Lux Venture Associates II, LLC
		its General Partner
	By:	Lux Capital Management, LLC
		its Sole Member
		By:	*
			Name: Robert Paull
			Title: Managing Director
Lux Ventures II Partners Fund I, LLC
By:	Lux Venture Partners II, L.P.
	its Manager
	By:	Lux Venture Associates II, LLC
		its General Partner
	By:	Lux Capital Management, LLC
		its Sole Member
		By:	*
			Name: Robert Paull
			Title: Managing Director

CUSIP No. 15708Q105 13G Page 17 of 20 Pages

Lux Venture Partners II, L.P.
By:	Lux Venture Associates II, LLC
	its General Partner
	By:	Lux Capital Management, LLC
		its Sole Member
		By:	*
			Name: Robert Paull
			Title: Managing Director
Lux Capital Management, LLC
By:	*
	Name: Robert Paull
	Title: Managing Director
*
Robert Paull
*
Joshua Wolfe
*
Peter Hebert

* By:	/s/ Robert Paull
	Robert Paull as
	Attorney-in-Fact

This Agreement was executed by Robert Paull pursuant to Powers of Attorney attached hereto as Exhibit 3 and incorporated herein by reference.