Table 1. Searching for a specific compound among all strains in the database.

Strain ID	Strain name	m/z	RT(min)	Intensity (×103)
MarineB0729	Tistrella bauzanensis	958.54	13.3	22194
MarineB0492	Thalassospira sp.	958.55	13.2	3442
MarineB0688	Thalassospira lucentensis	958.60	13.4	3437
MarineB0699	Thalassospira xiamenensis	958.60	13.4	3435
MarineB0462	Thalassospira xiamenensis	958.56	13.2	2958
MarineB0493	Thalassospira xiamenensis	958.57	13.2	842
MarineB0439	Tistrella mobilis	958.57	13.1	501
MarineB0453	Tistrella mobilis	958.55	13.2	173
MarineB0446	Tistrella mobilis	958.55	13.4	103
MarineB0450	Tistrella mobilis	958.55	13.2	99
MarineB0487	Thalassospira sp.	958.57	13.2	82
MarineB0486	Thalassospira lucentensis	958.56	13.2	71
Test sample	Thalassospira sp. CNJ328	958.55	13.5	45
MarineB0548	Bacillus circulans	958.55	13.5	43
MarineB0803	Pseudovibrio denitrificans	958.55	13.1	13

The compound thalassospiramide A was searched among all strains in the database, based on its m/z (958.55), retention time (13–14 min), and a characteristic fragment (m/z 390.2). The strain from which the compound was first discovered, Thalassospira sp. CNJ328, is labeled in red, and strains from non-Thalassospira species are labeled in blue.