When the virus was injected into a region of the hearts of seven guinea pigs, five later had heartbeats which originated from their new pacemaker.
With Aberdeen, Dundee United and Hibs all drawing, Hearts have pulled seven points clear in the race for European football.
Hibs' third successive loss means that they now sit eight points behind second-placed Celtic in the Scottish Premier League, while fifth-place Motherwell open up a seven-point gap on Hearts, who face Hamilton on Sunday.
There was something wonderful about the seven of us that captured the hearts and souls of young America.
Motherwell are a point ahead of Hibernian, who play Rangers on Sunday, and seven ahead of sixth-placed Hearts.
The Reds lie eighth in the league table, seven points behind sixth-placed Hearts, who have played a game more.
BBC: Aberdeen boss McGhee aims to revitalise stuttering Dons
Andy Webster's low drive restored Hearts' lead with seven minutes left and substitute Rudi Skacel blasted another on the break in stoppage time.
Hearts, who have seven days to lodge their appeal, have notified the SFA they will submit an appeal that will lead to the incident being discussed at the next committee meeting.
Craig Brown's side are now a point ahead of Hibernian, who play Rangers on Sunday, and seven in front of sixth-placed Hearts.
Aberdeen rarely looked like levelling the match and when Charlie Richmond blew to end the contest they found themselves, with five games remaining before the league split, seven points away from sixth-placed Hearts.
Stewart, Hearts' top scorer this season on seven goals, is set to miss Saturday's Edinburgh derby with the calf tear that has ruled him out of his team's last two matches.
Managerless Inverness have lost their last seven league outings and face a daunting visit to Tynecastle, where Hearts have lost just twice this season.
The result was an end-to-end affair from the kick-off, but it was Hearts who were the more dangerous and forced the first save of the game after seven minutes.
's own figures, seven and a half million people could be dead come spring -- an interesting way to win hearts and minds.
The plight of Ali, whose parents, brother and seven other family members died in the attack in the Diala Bridge district east of the capital, touched the hearts of many around the world.
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