def _isSequenceHead(line):
if len(line) < <NUM_LIT:1>:<EOL><INDENT>return False<EOL><DEDENT>if line[<NUM_LIT:0>] == '<STR_LIT:@>':<EOL><INDENT>return True<EOL><DEDENT>return False<EOL>
Determine if a string represents a sequence header line in fastq format.
Sequence headers start with the '@' symbol, and are followed by sequence
data.

:param line:      The line/string to check
:return: True if the given line conforms to the sequence header format for
         a fastq sequence