How can I get second line in a file using SED

@SRR005108.1 :3:1:643:216
GATTTCTGGCCCGCCGCTCGATAATACAGTAATTCC
+
IIIIII/III*IIIIIIIIII+IIIII;IIAIII%>

With the data that looks like above I want only to get

 GATTTCTGGCCCGCCGCTCGATAATACAGTAATTCC
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