Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Flagship Pioneering Inc.

2. Date of Event Requiring Statement (MM/DD/YYYY) 10/13/2022

3. Issuer Name and Ticker or Trading Symbol

Axcella Health Inc. [AXLA]

(Last) (First) (Middle)

55 CAMBRIDGE PARKWAY, SUITE 800E

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director ___X___ 10% Owner
_____ Officer (give title below) _____ Other (specify below)

(Street)

CAMBRIDGE, MA 02142

(City) (State) (Zip)

5. If Amendment, Date Original Filed(MM/DD/YYYY)

6. Individual or Joint/Group Filing(Check Applicable Line)

___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	3048780 ⁽¹⁾	I	By FPA, L.P. ⁽²⁾

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:
(1)	On October 13, 2022, FPA, L.P. ("FPA Fund") purchased 3,048,780 shares of the Issuer's Common Stock in a registered direct offering at a price of $1.64 per share pursuant to a Securities Purchase Agreement dated October 13, 2022
(2)	Shares held by FPA Fund. FPA General Partner LLC ("FPA Fund GP") is the general partner of FPA Fund. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of FPA Fund GP. Noubar B. Afeyan, Ph.D. is the CEO and sole stockholder of Flagship Pioneering. Each of the reporting persons except for FPA Fund disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Flagship Pioneering Inc. 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE, MA 02142		X
FPA General Partner LLC 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE, MA 02142		X
FPA, L.P. 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE, MA 02142		X

Signatures
Flagship Pioneering, Inc., By: /s/ Noubar B. Afeyan, PhD., Name: Noubar B. Afeyan, Ph.D., Title: Chief Executive Officer		10/17/2022
^**Signature of Reporting Person		Date
FPA General Partner LLC, By: Flagship Pioneering, Inc., its manager, By: /s/ Noubar B. Afeyan, PhD., Name: Noubar B. Afeyan, Ph.D., Title: Chief Executive Officer		10/17/2022
^**Signature of Reporting Person		Date
FPA, L.P., By: FPA General Partner LLC, its general partner, By: Flagship Pioneering, Inc., its manager, By: /s/ Noubar B. Afeyan, PhD., Name: Noubar B. Afeyan, Ph.D., Title: Chief Executive Officer		10/17/2022
^**Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

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AXLA Axcella Health Inc