They do make a host of florescent proteins, and these may interact with the light of the ROV to give that gorgeous glow.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	3	nsubj	3:nsubj	Discourse=joint-list_m:85->46:2|Entity=(78-animal-giv:act-cf1*-1-ana)
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	aux	3:aux	_
3	make	make	VERB	VB	VerbForm=Inf	0	root	0:root	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	5:det	Entity=(87-substance-new-cf2-2-coref
5	host	host	NOUN	NN	Number=Sing	3	obj	3:obj	_
6	of	of	ADP	IN	_	8	case	8:case	_
7	florescent	florescent	ADJ	JJ	Degree=Pos	8	amod	8:amod	_
8	proteins	protein	NOUN	NNS	Number=Plur	5	nmod	5:nmod:of	Entity=87)|SpaceAfter=No
9	,	,	PUNCT	,	_	13	punct	13:punct	_
10	and	and	CCONJ	CC	_	13	cc	13:cc	Discourse=elaboration-additional:86->85:0
11	these	this	PRON	DT	Number=Plur|PronType=Dem	13	nsubj	13:nsubj	Entity=(87-substance-giv:act-cf2-1-ana)
12	may	may	AUX	MD	VerbForm=Fin	13	aux	13:aux	_
13	interact	interact	VERB	VB	VerbForm=Inf	3	conj	3:conj:and	_
14	with	with	ADP	IN	_	16	case	16:case	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	16:det	Entity=(46-abstract-giv:inact-cf4-2-coref
16	light	light	NOUN	NN	Number=Sing	13	obl	13:obl:with	_
17	of	of	ADP	IN	_	19	case	19:case	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	Entity=(88-object-new-cf5-2-sgl
19	ROV	ROV	NOUN	NN	Number=Sing	16	nmod	16:nmod:of	Entity=88)46)
20	to	to	PART	TO	_	21	mark	21:mark	Discourse=causal-result:87->86:0
21	give	give	VERB	VB	VerbForm=Inf	13	advcl	13:advcl:to	_
22	that	that	DET	DT	Number=Sing|PronType=Dem	24	det	24:det	Entity=(45-abstract-giv:act-cf3-3-coref
23	gorgeous	gorgeous	ADJ	JJ	Degree=Pos	24	amod	24:amod	_
24	glow	glow	NOUN	NN	Number=Sing	21	obj	21:obj	Entity=45)|SpaceAfter=No
25	.	.	PUNCT	.	_	3	punct	3:punct	_
