Table 3. Search results for GSrCPs against unfiltered nrNCBI, showing highest alignment with silk and cement proteins.

	Cement Homology	E value	Coverage	Silk Homology	E value	Coverage
Leucine rich Cement Proteins (LrCPs)
Aa100-1	cement protein 100k [Amphibalanus amphitrite]	0	1	—	—	—
	114 kDa cement protein [Amphibalanus amphitrite]	0	0.84	—	—	—
	cement protein-100k [Megabalanus rosa]	0	0.84	—	—	—
Aa100-2	114 kDa cement protein [Amphibalanus amphitrite]	0	1	—	—	—
	cement protein 100k [Amphibalanus amphitrite]	0	0.98	—	—	—
	cement protein-100k [Megabalanus rosa]	0	1	—	—	—
Aa52-1	52 kDa cement protein [Amphibalanus amphitrite]	0	1	—	—	—
	52kDa cement protein [Megabalanus rosa]	2.00E-158	0.99	—	—	—
AaCP20-1	cement protein 20 kDa-1 [Amphibalanus amphitrite]	7.00E-87	0.92	—	—	—
	cement protein 20 kDa-3 [Amphibalanus amphitrite]	1.00E-40	0.84	—	—	—
	cement protein 20 kDa-2 [Amphibalanus amphitrite]	2.00E-27	0.91	—	—	—
Glycine/Serine rich Cement Proteins (GSrCPs)
AaCP19	19 kDa cement protein [Amphibalanus amphitrite]	7.00E-141	1	—	—	—
	cement protein-19k [Fistulobalanus albicostatus]	2.00E-77	0.85	—	—	—
	cement protein-19k [Balanus improvisus]	3.00E-60	0.85	—	—	—
Aa19-2	cement protein-19k [Fistulobalanus albicostatus]	2.00E-20	0.86	cross-beta structure silk protein 1 [Mallada signata]	9.00E-32	0.98
	cement protein-19k [Megabalanus rosa]	4.00E-19	0.92	silk sericin MG-1 [Galleria mellonella]	7.00E-25	0.92
	19 kDa cement protein [Amphibalanus amphitrite]	8.00E-19	0.88	cross-beta structure silk protein 2 [Mallada signata]	8.00E-25	0.91
Aa19-3	cement protein-19k [Megabalanus rosa]	4.00E-29	0.81	pyriform spidroin 2 [Nephila clavipes]	5.00E-15	0.93
	cement protein-19k [Fistulobalanus albicostatus]	1.00E-27	0.74	piriform spidroin [Nephila clavipes]	3.00E-11	0.96
	19 kDa cement protein [Amphibalanus amphitrite]	3.00E-25	0.84	piriform-like spidroin [Nephilengys cruentata]	1.00E-10	0.86
Aa19-4	cement protein-19k [Fistulobalanus albicostatus]	1.00E-28	0.69	silk sericin MG-1 [Galleria mellonella]	2.00E-17	0.7
	19 kDa cement protein [Amphibalanus amphitrite]	2.00E-22	0.81	cross-beta structure silk protein 1 [Mallada signata]	1.00E-16	0.72
	cement protein-19k [Megabalanus rosa]	3.00E-20	0.81	cross-beta structure silk protein 2 [Mallada signata]	2.00E-14	0.73
Aa19-5	cement protein-19k [Balanus improvisus]	4.00E-08	0.69	cross-beta structure silk protein 1 [Mallada signata]	1.00E-10	0.95
	—	—	—	sericin 3 precursor [Bombyx mori]	1.00E-09	0.88
	—	—	—	cross-beta structure silk protein 2 [Mallada signata]	1.00E-09	0.94
Aa43-1	cement protein-19k [Balanus improvisus]	1.50E-01	0.26	cross-beta structure silk protein 1 [Mallada signata]	3.00E-33	0.8
	—	—	—	silk sericin MG-1 [Galleria mellonella]	7.00E-29	0.81
	—	—	—	cross-beta structure silk protein 2 [Mallada signata]	3.00E-26	0.8