let targetXLymphocyte = function (creature) {
    let cohesion = creature.cohesion(world.bacterias);
    return cohesion.x / world.width;
  }

  let targetYLymphocyte = function (creature) {
    let cohesion = creature.cohesion(world.bacterias);
    return cohesion.y / world.height;
  }

  let targetAngleLymphocyte = function (creature) {
    let alignment = creature.align(world.bacterias);
    return (alignment.angle() + Math.PI) / (Math.PI * 2);
  }